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Two masses m and 2m are attached to two ends of an ideal spring and the spring is in the compressed state. The energy of spring is 60 joule. If the spring is released, then 

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the energy of both bodies will be same
energy of smaller body will be 10J
energy of smaller body will be 20J
energy of smaller body will be 40 J

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detailed solution

Correct option is D

Fext =0 From momentum conservation  P1+P2=0 m1v1+(-m2v2)=0 m1m2=v2v1&v2v1=12 k1k2=m1v12m2v22=12212=2 Now k1+k2=60 ⇒k1+k12=60  =k1=40 J

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