Two balls, one twice as massive as the other, are dropped from the roof of a building (freefall). Just before hitting the ground, the more massive ball has the kinetic energy of the less massive ball. (Neglect air friction.)

In a system, when potential energy decreases, then entropy also decreases. true false

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

Explain what happens at the saturation point when adding salt to water at room temperature.