4. A girl is skipping rocks across a lake. One of the rocks accidentally ricochets off a toy boat initially at rest in t

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4 A Girl Is Skipping Rocks Across A Lake One Of The Rocks Accidentally Ricochets Off A Toy Boat Initially At Rest In T 1 (352.01 KiB) Viewed 34 times

4. A girl is skipping rocks across a lake. One of the rocks accidentally ricochets off a toy boat initially at rest in the water (see the picture). The 0.150−kg rock strikes the boat at a velocity of 13 m/s,15∘ below due east, and ricochets off at a velocity of 11 m/s,12∘ above due east. If the boat has a mass of 1.10 kg and assuming the water and air offer no resistance in the x direction, but the boat does not move in the y direction, find the following: (a) The velocity of the boat after the impact. (b) If the impact took 0.025 s to occur, what was the average force between the rock and the block (magnitude and direction)? (c) How much energy is lost during