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Q.

Two blocks sit on a horizontal frictionless surface connected to an ideal spring. Initially everything is at rest and there is a string compressing the mass spring system from equilibrium. At some time after the string is cut, the block of mass 2M reaches its maximum kinetic energy K . What maximum kinetic energy does the block of mass M attain in terms of K ?

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a

14K

b

12K

c

K

d

2K

answer is D.

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Detailed Solution

p1=p2=p K1=p22M      K2=K=p22×2M ⇒K1=2K

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