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A massive vertical wall is approaching a...

A massive vertical wall is approaching a man at a speed `mu`. When it is at a distance of 10m, the man throws a ball with speed 10 m/s at an angle of `37^(@)`, which after having a completely elastic collision with the wall, reaches back directly into the hands of the man. The velocity of the wall is

A

`13/3 m//s`

B

`18/2` m/s

C

`26/4` m/s

D

`31/5` m/s

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The correct Answer is:
A
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