Q 1107856788.     A block lying on a smooth surface with spring connected to it; is being pulled by an external force as shown. Initially the velocity of ends A and B of the spring are `4` m/s and `2` m/s respectively. If the energy of the spring is increasing at the rate of `20` J/sec, then the stretch in the spring is


JEE-MIS
A

`2.0` cm

B

`10` cm

C

`2.0` cm

D

`1.0` cm

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