A rock is hurled upward from a high bridge with an initial upward speed of 30 m/

Question

A rock is hurled upward from a high bridge with an initial upward speed of 30 m/s. Eventually, the rock lands in the river, 50 m below the initial release point. For the following statements, displacements are measured relative to the release point and the upward direction is positive.
True or False
T/F The maximum speed occurs on the way down at the instant when the rock pass the initial release point.

T/F During the entire flight, the displacement of the rock is positive or zero.
T/F At its highest point, the rock has zero velocity.
T/F At its highest point, the rock has zero acceleration.

Explanation / Answer

The maximum speed occurs on the way down at the instant when the rock pass the initial release point. --- False, the maximum speed occurs on the way down at the instant when the rock hits the water. During the entire flight, the displacement of the rock is positive or zero. --- False, the displacement of the rock is negative 50 m At its highest point, the rock has zero velocity. --- True At its highest point, the rock has zero acceleration. --- False , the rock has acceleration -9.8 m/s^2

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