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 kinetic energy as that of the boy. The original speed of the man is :
√2m/s
1√2m/s
1√2−1m/s
(√2−1)m/s
A
√2m/s
B
(√2−1)m/s
C
1√2m/s
D
1√2−1m/s
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