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 drawing). The 0.072-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. After being struck by the rock, the boat's velocity is 2.0 m/s, due east. What is the mass of the boat? Assume the water offers no resistance to the boat's motion.

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A: Concept:

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