A man who is running has half the kineti...

A man who is running has half the kinetic energy of a boy of half his mass. The man speeds up by 1 `ms^(-1)` and then has the same kinetic energy as the boy. The original speeds of the man and the boy was:

`sqrt2m//s`

`(sqrt2-1)m//s`

`2m//s`

`(sqrt2+1)m//s`

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