Two blocks M1 and M2 having equal mass are free to move on a horizontal frictionless surface. M2 is attached to a massless spring. Initially M2 is at rest and M1 is moving toward M2 with speed v and collides head-on with M2. Which of the following statements is correct?

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Physics · Work, Energy and Power

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Correct answer

If the spring is massless, the final state of M1 is a state of rest.

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Answer 1

While the spring is fully compressed, all the kinetic energy of M1 is stored as potential energy of the spring.

Answer 2

While the spring is fully compressed, the system momentum is not conserved, though final momentum is equal to initial momentum.

Answer 3

If the spring is massless, the final state of M1 is a state of rest.

Answer 4

If the surface on which blocks are moving has friction, then the collision cannot be elastic.

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