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What is the acceleration of a driver that starts his car and within 5 seconds reaches a velocity of 54 mph?
Wiki User
∙ 14y ago
Instead of the wishy-washy term "... within ...", let's assume that he reaches the final speed in 5 seconds,
so that we actually know when it was, and we can do math with it.
Average acceleration = (change in speed) divided by (time for the change)
54 mph / 5 sec = 10.8 miles per hour per second
If this rather ugly and unfamiliar unit makes you uncomfortable, the answer can be converted
into other units, which are exactly equivalent but more appealing:
-- 15.84 feet per second2
-- 38,880 miles per hour2
-- 4.828 meters per second2
Wiki User
∙ 14y ago
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Can the velocity of an object be zero at the same instant its acceleration is not zero?
Consider the gravitational pull of the earth and acceleration due to gravity. When you throw a ball in the air, at the highest point, it is stopped and has a velocity of 0. However, if the acceleration of the ball was also 0, then the ball would not be able to come back down to the earth. In order for the ball to come back down, there must be an acceleration. This acceleration is the acceleration due to gravity which is constant at the surface of the earth at 9.8 m/s^2. Another example: Say a car is rolling down a hill backwards. In order to stop the car from rolling more, the driver accelerates. After a certain amount of time, the car will stop (with velocity of 0) and then it will start moving up the hill again. When it is stopped, the car is still accelerating in order to overcome the force of gravity pulling the car down the hill.Technically, an object is accelerating if it's changing it's velocity. This includes speeding up, slowing down, and turning. So, yeah, if an object isn't moving at all, but is turning, it's still accelerrating.
How does positive and negative acceleration affect motion?
positive acceleration helps to increase the velocity for positive direction while negative acceleration resists the motion.
What does a negative slope on an acceleration vs time graph mean?
No. A negative slope means that the object is slowing down. If the object were not moving, then its velocity would be zero. The graph would be a straight horizontal line that just lays there on the time axis.
A sentence for negative acceleration?
Yes, negative acceleration is slowing down. Take the example of a car going from 0 to 60 mph this would be positive acceleration. If once it reaches 60 mph the foot is removed from the petal the car will continue to move but due to friction and wind resistance it will begin to slow down, while slowing down it is in negative acceleration.
Does a change in direction change acceleration?
Not exactly, it can change a few degrees of its direction, but cannot change its velocity because if it stops, the force of motion that goes with it will demolish the car therefore it cannot change it's velocity.++++???? If you put the question in everyday language, it is asking "Can a car change direction while accelerating?"Yes it can, provided the driver is careful to keep the acceleration and instant speed within safe limits. I emphasise 'speed' because the direction hence velocity - a vector value - is changing.I have no idea of the point about the remark about stopping - the supposed consequences are fiction, and the question is about accelerating.
A driver starts his parked car and within 5 seconds reaches a velocity of 54 km per hour as he travels east what is his acceleration?
vf=54 km/hr vi=0km/hr t=5sec/0.001hr a=5400 km/hr 54km/hr- 0km/hr --------------------- 0.001 hr
What is driver the game rated?
Its rated X for X-treme acceleration, velocity and collisions!
What is the game mass driver rated?
Its rated X for X-treme acceleration, velocity and collisions!
What is the meaning of acceleration?
of Accelerate
Can the velocity of an object be zero at the same instant its acceleration is not zero?
Consider the gravitational pull of the earth and acceleration due to gravity. When you throw a ball in the air, at the highest point, it is stopped and has a velocity of 0. However, if the acceleration of the ball was also 0, then the ball would not be able to come back down to the earth. In order for the ball to come back down, there must be an acceleration. This acceleration is the acceleration due to gravity which is constant at the surface of the earth at 9.8 m/s^2. Another example: Say a car is rolling down a hill backwards. In order to stop the car from rolling more, the driver accelerates. After a certain amount of time, the car will stop (with velocity of 0) and then it will start moving up the hill again. When it is stopped, the car is still accelerating in order to overcome the force of gravity pulling the car down the hill.Technically, an object is accelerating if it's changing it's velocity. This includes speeding up, slowing down, and turning. So, yeah, if an object isn't moving at all, but is turning, it's still accelerrating.
How does positive and negative acceleration affect motion?
positive acceleration helps to increase the velocity for positive direction while negative acceleration resists the motion.
Which lane delivers the driver to the acceleration lane and primarily gives the driver time to evaluate highway traffic conditions?
Acceleration Lane
What does a negative slope on an acceleration vs time graph mean?
No. A negative slope means that the object is slowing down. If the object were not moving, then its velocity would be zero. The graph would be a straight horizontal line that just lays there on the time axis.
A sentence for negative acceleration?
Yes, negative acceleration is slowing down. Take the example of a car going from 0 to 60 mph this would be positive acceleration. If once it reaches 60 mph the foot is removed from the petal the car will continue to move but due to friction and wind resistance it will begin to slow down, while slowing down it is in negative acceleration.
Does a change in direction change acceleration?
Not exactly, it can change a few degrees of its direction, but cannot change its velocity because if it stops, the force of motion that goes with it will demolish the car therefore it cannot change it's velocity.++++???? If you put the question in everyday language, it is asking "Can a car change direction while accelerating?"Yes it can, provided the driver is careful to keep the acceleration and instant speed within safe limits. I emphasise 'speed' because the direction hence velocity - a vector value - is changing.I have no idea of the point about the remark about stopping - the supposed consequences are fiction, and the question is about accelerating.
A car traveling at a velocity of 50 mph crashed into a brick wall What is the velocity of the driver the moment after impact if the driver was not wearing his seatbelt?
55mph (studyisland)
A driver in a car traveling at a speed of 21point8 meters per second sees a cat 101 m away on the road How long will it take for the car to accelerate uniformly to a stop in exactly 99 m?
Initial velocity = 21.8 m/sFinal velocity = 0Average velocity = 10.9 m/sDistance = (average velocity) x (time)Time = (distance) / (average velocity) = 99/10.9 = 9.083 seconds (rounded)
