A 65 kg swimmer jumps off a 10 m tower. Find the swimmer's velocity on hitting the water.

The swimmer comes to a stop 2 m below the surface. Find the net force exerted by the water.

An astronaut on the moon throws a baseball upward. the astronaut is 6 ft, 6 in. tall, and the initial velocity of the ball is 3030 ft per sec. the height s of the ball in feet is given by the equation s equals negative 2.7 t squared plus 30 t plus 6.5s=−2.7t2+30t+6.5, where t is the number of seconds after the ball was thrown. complete parts a and b.