A 0.2 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? a. The distance the rock travels in the first 5 s of its descent in the waterb. The acceleration of the rock 2 s before it reaches the lake bottomc. The change in potential energy of the rock-Earth-water system during the final 3 s of the rock's descent. d. The speed of the rock as it enters the lake