A0.060-kg tennis ball, initially moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s.

what is the change in momentum of the ball?
a) 0.72 kg·m/s

b) 0.36 kg·m/s

c) 1.1 kg·m/s

d) 1.8 kg·m/s

If steel is more dense that lake water, why can a boat float

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

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