Recent content by rk1991

Homework Statement A tennis ball has a mass of 0.057 kg. A professional tennis player hits the ball hard enough to give it a speed of 50 m/s (about 112 miles per hour.) The ball moves toward the left, hits a wall and bounces straight back to the right with almost the same speed (50 m/s). As...

Homework Statement A bullet of mass 0.125 kg traveling horizontally at a speed of 150 m/s embeds itself in a block of mass 2.5 kg that is sitting at rest on a nearly frictionless surface. What is the speed of the block after the bullet embeds itself in the block? Homework Equations...

Homework Statement Two rocks are tied together with a string of negligible mass, and thrown into the air. At a particular instant, rock 1, which has a mass of 0.2 kg, is headed straight up with a speed of 2 m/s, and rock 2, which has a mass of 0.35 kg, is moving parallel to the ground, in the...