A rock is thrown from the edge of a cliff with an initial velocity v_0 at an ang

Question

A rock is thrown from the edge of a cliff with an initial velocity v_0 at an angle theta with the horizontal as shown above. Point P is the highest point in the rock's trajectory and point e is level with the starting point. Assume air resistance is negligible. Which of the following correctly describes the horizontal and vertical speeds and the acceleration of the rock at point P? Which of the following correctly describes the horizontal and vertical speeds and the acceleration of the rock at point Q?

Explanation / Answer

7) A

because, at point P vertical velocity becomes zero.

and horizontal component of velocity is constant throughout the motion.

8) D

at point Q, the rock will have same speed as it had when it was projected.

so, the magnitude of components of velocity at point Q are same as initial velocity components.

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