You drop a ball from a height of 2.0 m, and it bounces back to a height of 1.5 m. a) what fraction of its initial energy is lost? b) what is the ball's speed after the bounce? c) where did the energy go?

The fraction of energy that is lost is 25%, it depends how fast the ball was going until it lost 25% of its energy, the gravitational energy was transferred into the kinetic energy that helped the ball bounce back