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If a man increases his speed by 2ms^(-1)...

If a man increases his speed by `2ms^(-1)`, his K.E. is doubled. The original speed of the man is :

A

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

B

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

C

`4ms^(-1)`

D

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

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