Created by StemPy LabA ball is dropped from rest onto a hard floor and bounces again and again. Each bounce is perfectly elastic and takes a negligible time. Taking upward as positive, which graph shows the velocity of the ball against time?
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← A bullet of mass 20 g moving at 300 m/s passes straight through a wooden block of mass 1 kg that rests on a smooth horizontal floor. It comes out of the other side at 100 m/s. The speed of the block afterwards, and the kinetic energy turned into heat and sound, areTwo satellites move in circular orbits around the same planet, one of radius R and the other of radius 4R. The ratio of their speeds (vR : v_4R) and the ratio of their periods (TR : T_4R) are →
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