if an object moves in the same direction and at a constant speed for 4 hours, which of the following is true?
a. the object's speed changed during the 4 hours
b. the object's velocity did not change.
c. the object accelerated during the 4 hours.
d. the object decelerated during the 4 hours.<-------- the answer to this is b
The runner is maintaining a steady speed and covering equal distances in equal time intervals.
The change in a runner's velocity with time is determined by their acceleration. If the runner is speeding up, their velocity is increasing, resulting in a positive acceleration. If the runner is slowing down, their velocity is decreasing, resulting in a negative acceleration. Acceleration is the rate of change of velocity with respect to time.
Their acceleration is zero.
The greatest acceleration a runner can achieve is 0.28 times the acceleration due to gravity (0.28g), where g is 9.81 m/s^2. This is because the frictional force is equivalent to 0.72 times the runner's weight, which opposes the force of the runner's push-off.
The runner's acceleration can be calculated using the formula: ( acceleration = \frac{change\ in\ velocity}{time} = \frac{6 m/s - 4 m/s}{20 s} = 0.1 , m/s^2 ). So, the runner's acceleration is ( 0.1 , m/s^2 ).
The runner is maintaining a steady speed and covering equal distances in equal time intervals.
The change in a runner's velocity with time is determined by their acceleration. If the runner is speeding up, their velocity is increasing, resulting in a positive acceleration. If the runner is slowing down, their velocity is decreasing, resulting in a negative acceleration. Acceleration is the rate of change of velocity with respect to time.
Their acceleration is zero.
Assuming that acceleration is constant during that time, just divide the change in speed by the time.
Acceleration
The greatest acceleration a runner can achieve is 0.28 times the acceleration due to gravity (0.28g), where g is 9.81 m/s^2. This is because the frictional force is equivalent to 0.72 times the runner's weight, which opposes the force of the runner's push-off.
As long as the coach does not assist the runner, there is no penalty.
The runner's acceleration can be calculated using the formula: ( acceleration = \frac{change\ in\ velocity}{time} = \frac{6 m/s - 4 m/s}{20 s} = 0.1 , m/s^2 ). So, the runner's acceleration is ( 0.1 , m/s^2 ).
no
The law of acceleration in running is demonstrated when a runner increases their speed over a distance. As the runner applies more force to the ground with each stride, they experience an acceleration that allows them to gradually increase their velocity until they reach their desired speed.
Acceleration is involved in running as it refers to the rate at which a runner increases their speed over time. When a runner starts a race, they accelerate to reach their maximum speed. Acceleration is also important when a runner needs to change their speed or direction quickly during a race.
The runner's acceleration can be calculated using the formula: acceleration = (final velocity - initial velocity) / time. Plugging in the values, we get: acceleration = (2 m/s - 6 m/s) / 2 s = -2 m/s^2. The negative sign indicates the acceleration is in the opposite direction of the initial velocity.