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Q.
At the maximum height of a body thrown vertically up
Motion in a Straight Line
Solution:
At the maximum height reached, the body comes to rest and thus its velocity becomes zero while the acceleration due to gravity ($g=9.8\, m/s^2$
) acting on it continues to act in downward direction and tries to bring the body back to the ground.
Thus at maximum height, the acceleration of the body is non-zero but its velocity is zero.