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9.8 m/s (2) Squared

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Q: Acceleration of a rock thrown straight upward at the moment it reaches the tippy-top of its trajectory?
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Is the acceleration of a projectile equal to zero when it reaches the top of its trajectory?

No, assuming no air resistance, there will be a constant downward acceleration of 9.8 meters per second square (assuming standard gravity). The vertical component of the velocity will be zero at the top of the trajectory.


Can an object have a speed of zero and the acceleration not be zero?

Yes, but only at one instant. For instance, if you throw an object straight up, when it reaches the highest point its instantaneous speed is zero, but of course its speed is changing - thus, acceleration is non-zero.


When an object reaches its termainal speed its acceleration is zero right?

Acceleration is zero when the object's speed and direction stop changing.


Give example where the velocity of the particle is 0 and acceleration is maximum?

When a pendulum reaches its maximum elongation the velocity is zero and the acceleration is maximum


What is the acceleration due to gravity when a body reaches the ground?

The acceleration is still 9.8 m/s2 but the force applied by gravity is counteracted by the ground.


What is the rate of acceleration for a car that reaches a speed of three meters per second?

Insufficient information.


An object that reverses direction while its acceleration remains constant?

An object can reverse direction anytime its velocity is in the opposite direction of its acceleration.A good example is throwing a ball straight up into the air. As soon as the ball leaves your hand, the acceleration due to gravity begins to slow it down. Even though the initial velocity is going straight up, once the ball leaves your hand the acceleration is constantly pulling the ball back towards earth. The ball eventually reaches its peak height, and reverses direction, falling back to earth. This all happens while the acceleration remains constant.


What happens to the acceleration of a simple pendulum as it approaches the lowest point of its swing?

The velocity reaches a maximum, and the pendulum will begin to decelerate. Because the acceleration is the derivative of the velocity, and the derivative at the location of an extrema is zero, the acceleration goes to zero.


Is acceleration greater when the object is thrown vertically or horizontally?

Acceleration is dependent on the initial velocity of how fast the object is leaving the projectile. The vertical acceleration is greater when the object is falling than when the object reaches the peak in height. However, if the object is thrown horizontally and there is no parabola in its shape then there is not as great of an acceleration.


Why do engine looses acceleration after a certain speed?

Acceleration is the a change in speed or direction. Once a vehicle reaches a point where it is maintaining its speed but no longer increasing (or decreasing) the acceleration is zero. Even though you may be moving rapidly it is at a constant speed.


A car starts from rest and reaches 20 ms in 10 seconds The average acceleration of the car in ms2 is?

10


A stone is thrown straight up. when it reaches its highest point?

When the stone reaches its highest point, earth's gravity ensures it has to come down.