A man running has half the kinetic energy of a boy of half his mass. The man speeds up by 1 ms^(-1) and then has KE as that of the boy. What was the original speed of man?

A man running has half the kinetic energy of a boy of half his mass. T

1.	A man running has half the kinetic energy of a boy of half his mass. The man speeds up by 1 ms^(-1) and then has KE as that of the boy. What was the original speed of man?
Answer» `sqrt(2) ms^(-1)` `(sqrt(2)-1) ms^(-1)` `(sqrt(2) +1) ms^(-1)` None of these Answer :C