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Two putty balls of equal mass moving wit...

Two putty balls of equal mass moving with equal velocity in mutually perpendicular direction, stick together after collision. If the balls were initially moving with a velocity of `45sqrt(2)jms^(-1)` each, the velocity of their combined mass after collision is

A

`45sqrt(2)ms^(-1)`

B

`45ms^(-1)`

C

`90ms^(-1)`

D

`22.5sqrt(2)ms^(-1)`

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The correct Answer is:
B
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