Problem: Boxes A and B are at rest on a horizontal frictionless surface with a compressed spring of negligible mass between them. Box a has mass 2.0 kg and box B has 4.0 kg. When the spring is released the two boxes move off in opposite direction and the spring is left behind. After the boxes have moved away from the spring,A) the magnitude of the momentum of A is less than the magnitude of the momentum of BB) the magnitude of the momentum of A is greater than the magnitude of the momentum of BC)  the magnitude of the momentum of A is equals than the magnitude of the momentum of BD) the kinetic energy of A equals the kinetic energy of B

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Problem Details

Boxes A and B are at rest on a horizontal frictionless surface with a compressed spring of negligible mass between them. Box a has mass 2.0 kg and box B has 4.0 kg. When the spring is released the two boxes move off in opposite direction and the spring is left behind. After the boxes have moved away from the spring,

A) the magnitude of the momentum of A is less than the magnitude of the momentum of B

B) the magnitude of the momentum of A is greater than the magnitude of the momentum of B

C)  the magnitude of the momentum of A is equals than the magnitude of the momentum of B

D) the kinetic energy of A equals the kinetic energy of B

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