Question

If the body of mass 2 kg is moving with velocity 15m/s collides with a stationary body of the same mass then after the elastic collision the second body will move with which velocity? ​

Answer 1

Explanation:

The answer is 1.2 kg

$By \: conservation \: of \: linear \: momentum</p><p> \: 2v0=2(4v0)+mv⇒2v0=2v0+mv⇒23v0 \: =mv.... \\ (1)</p><p>since \: collision \: is \: elastic</p><p> \\ vseparation \: =vapprach⇒v−4v0=v0⇒45v0=v.... \\ (2)</p><p>equating \\ (2) and (1)</p><p> \\ 43v0=m(45v0)⇒m=56=1.2kg</p><p></p><p>$

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