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The track shown in the figure is frictio...

The track shown in the figure is frictionless. The block B of mass 4kg is lying at rest and block A of mass 2kg is pushed along the track with some speed. The collision between A and B is perfectly elastic. With that velocity should the block A start such that block B just reaches at point P ?

A

`10m//s`

B

`5 m//s`

C

`20 m//s`

D

`15 m//s`

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The correct Answer is:
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