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The spring block system lies on a smooth...

The spring block system lies on a smooth horizontal surface. The free end of the spring is being pulled towards right with constant speed `v_(0) = 2m//s`. At `t = 0 sec`, the spring of constant `k = 100 N//cm` is unstretched and the block has a speed `1 m//s` to left. The maximum extension of the spring is.
.

A

2 cm

B

4 cm

C

6 cm

D

8 cm

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