Two balls of equal mass, moving with speeds of 3 m/s, collide head-on. Find the speed of each after impact if (a) they stick together, (b) the collision is perfectly elastic, (c) the coefficient of restitution is 1/3. Ans. (a) 0 m/s; (b) each rebounds at 3 m/s; (c) each rebounds at 1 m/s
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