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In the figure shown m(1) = 1 kg , m(2) =...

In the figure shown `m_(1) = 1 kg , m_(2) = 2 kg `, pulley is ideal . At t = 0 , both masses touches the ground and string is tout . A force F = 2t is applied to pulley ( t is in second ) then `m_(1)` is lifted off the ground at time ( g = 10 `m//s^(2))`

A

5 s

B

12 s

C

10 s

D

15s

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The correct Answer is:
C
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