A girl is skipping stones across a lake. One of the stones accidentally ricochets off a toy boat that is initially at rest in the water (see the drawing). The 0.072-kg stone strikes the boat at a velocity of 13 m/s, 15o below due east, and ricochets off at a velocity of 11 m/s, 12o above due east. After being struck by the stone, the boat's velocity is 2.1 m/s, due east. What is the mass of the boat? Assume the water offers no resistance to the boat's motion.

Transcribed Image Text:

11 m/s -East 15° 13 m/s 七一East 120