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Four smooth steel balls of equal mass at...

Four smooth steel balls of equal mass at rest are free to move along as straight line without friction. The first ball is given a velocity of `0.4 m//s` It colloids head on with the second elastically, the second one similarly with the third and so on. the velocity of the last ball is :

A

`0.4 m//s`

B

`0.2 m//s`

C

`0.1 m//s`

D

`0.05 m//s`

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The correct Answer is:
A
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