A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by $1\,m/s$ so as to have same K.E. as that of the boy. The original speed of the man will be
A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by $1\,m/s$ so as to have same K.E. as that of the boy. The original speed of the man will be
- A
$\sqrt 2 \,m/s$
- B
$(\sqrt 2 - 1)\,m/s$
- C
$\frac{1}{{(\sqrt 2 - 1)}}m/s$
- D
$\frac{1}{{\sqrt 2 }}m/s$
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