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Consider the situation shown in diagram in which a hollow cylindrical box of mass m, open at one end is connected to an ideal spring. Initially spring is compressed and box having mass m is kept stationary. Spring is attached with box but not attached with wall and initially held at rest. Now box is released. Choose INCORRECT options

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Work done by wall on spring plus box system is positive

Work done by wall on box plus spring system is zero

Change in kinetic energy of box plus spring system is zero

Work done by wall on box plus spring system is zero but change in kinetic energy of this systems is positive, so work energy theorem fails in this case

answer is B, C, D.

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Detailed Solution

(BCD)
Sol.: Internal force can also change the kinetic energy of system.

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