Q: Two balls B1 and B2 collide head on and elastically. They are of same mass and initially the ball B2 is at rest. Which of the following statements is true after the collision ?
(a) B1 returns along the same path and B remains at rest
(b) B1 returns and B2 moves forward
(c) B1 comes to rest and B2 moves forward
(d) None of the above
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