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?

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.