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A running man has half the KE that a bod...

A running man has half the KE that a body of half his mass has. The man speeds up by `1.0ms^(-1)` and then has the same energy as the boy. What were the original speeds of the man and the boy?

A

`2.4 m//sec, 4.8m//sec`

B

`4.8m//sec, 2.4m//sec`

C

`4.2 m//sec, 8.4m//sec`

D

`8.4m//sec, 4.2m//sec`

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The correct Answer is:
A
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