judy (mass 40 kg), standing on slippery ice, catches her leaping dog (mass = 15 kg) moving horizontally at 3 m/s. What is the speed of Judy and her dog is after the catch?

Dwayne Johnson is standing on a bridge and throws the rock, mass of 4 kg, straight up with an initial velcocity of 10 m/s.  If the bridge is 5 meters above the water, (a) how fast is the rock going when it reaches the surface of the water. (b) how long does it take to reach the surface of the water?

A tennis ball has a mass of 0.055 kg. A professional tennis player hits the ball hard enough to give it a speed of 52 m/s (about 117 miles per hour.) The ball moves toward the left, hits a wall and bounces straight back to the right with almost the same speed (52 m/s). As indicated in the diagram below, high-speed photography shows that the ball is crushed about d = 2.4 cm at the instant when its speed is momentarily zero, before rebounding. D Making the very rough approximation that the large force that the wall exerts on the ball is approximately constant during contact, determine the approximate magnitude of this force.

At what speed do a bicycle and its rider, with a combined mass of 90 kg , have the same momentum as a 1600 kg car traveling at 6.0 m/s ?