A ball is dropped from rest at height of 20m. If it loses 25% of its kinetic energy when it strikes the ground. What is the height to which it bounces?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

A2-kg bowling ball is 2.5 meters off the ground on a post when it falls. just before it reaches the ground, it is traveling 7 m/s. assuming that there is no air resistance, which statement is true?

The energy of a photon was found to be 3.38 × 10–19 j. planck’s constant is 6.63 × 10–34 j • s. which color of light corresponds to this photon?