Which of the following statements about projectile motion ARE correct? 1. The direction of both velocity and acceleration are changing across the motion trajectory 2. For a free fall object(the horizontal component of the initial velocity is zero), its velocity is zero when it reaches maximum height, but its acceleration is not zero at the same time.   3. The velocity direction is changing across the motion trajectory, but the acceleration direction remains the same.   4. For a free fall object(the horizontal component of the initial velocity is zero), both its velocity and acceleration are zero when it reaches maximum height.

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