# Question: A 0 20 kg object with a horizontal speed of hits a

A 0.20-kg object with a horizontal speed of hits a wall and bounces directly back with only half the original speed.

(a) What percentage of the object’s initial kinetic energy is lost: (1) 25%, (2) 50%, or (3) 75%?

(b) How much kinetic energy is lost in the ball’s collision with the wall?

(a) What percentage of the object’s initial kinetic energy is lost: (1) 25%, (2) 50%, or (3) 75%?

(b) How much kinetic energy is lost in the ball’s collision with the wall?

## Relevant Questions

A 1200-kg automobile travels at 90 km/h. (a) What is its kinetic energy? (b) What net work would be required to bring it to a stop? An out-of-control truck with a mass of 5000 kg is traveling at (about 80 mi/h) when it starts descending a steep (15o) incline. The incline is icy, so the coefficient of friction is only 0.30. Use the work– energy theorem ...A 0.50-kg mass is placed on the end of a vertical spring that has a spring constant of 75 N/m and eased down into its equilibrium position. (a) Determine the change in spring (elastic) potential energy of the system. (b) ...A 1.00-kg block (M) is on a flat frictionless surface (Fig. 5.32). This block is attached to a spring initially at its relaxed length (spring constant is 50.0 N/m). Alight string is attached to the block and runs over a ...A 0.50-kg mass is suspended on a spring that stretches 3.0 cm. (a) What is the spring constant? (b) What added mass would stretch the spring an additional 2.0 cm? (c) What is the change in potential energy when the mass ...Post your question