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Question

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 :
  1. 2m/s
  2. 12m/s
  3. 121m/s
  4. (21)m/s

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