At the top of its path,a projectile:

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(C) When a projectile is at the highest point of its trajectory,its vertical velocity becomes $0 \ m/s$,but it still possesses a horizontal velocity c

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has acceleration in the downward direction

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(C) When a projectile is at the highest point of its trajectory,its vertical velocity becomes $0 \ m/s$,but it still possesses a horizontal velocity component.However,the acceleration due to gravity $(g)$ acts constantly on the projectile throughout its entire flight.This acceleration is always directed vertically downwards towards the center of the Earth.Therefore,even at the top of its path,the projectile experiences a constant downward acceleration equal to $g$.

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