College Energy and Momentum Questions

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College Energy and Momentum

A 2 kg rock is dropped into a lake from a few meters above the surface of the water. The rock reaches terminal velocity in the lake after 5 s in the water. During the final 3 s of its descent to the lake bottom, the rock moves at a constant speed of 4 m/s. Which of the following can be determined from the information given? Select two answers.

A. The speed of the rock as in enters the lake.
B. The distance the rock travels in the first 5 s of its descent in the water.
C. The acceleration of the rock 2 s before it reaches the lake bottom.
D. The change in potential energy of the rock-Earth-water system during the final 3 s of the rock's descent.

A and B
A and C
B and C
B and D
C and D

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College Energy and Momentum Questions