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# 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/s1√2m/s1√2−1m/s(√2−1)m/s

A
2m/s
B
(21)m/s
C
12m/s
D
121m/s
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