On a horizontal frictionless air table, a puck runs into an ideal horizontal spr

Question

On a horizontal frictionless air table, a puck runs into an ideal horizontal spring that is fastened to the table the puck compresses the spring by 15 cm before coming to rest. During the compression process, which quantities are conserved?

A.) only the momentum of the puck

B.) only the kinetic energy of the puck

C.) only the mechanical energy (kinetic plus potential) of the puck

D.) the momentum and the mechanical energy of the puck

E.) the momentum and the kinetic energy of the puck

Please explain why you choose the answer you do, I'm not understanding.

Explanation / Answer

both momentum and mechanical energy is conserved

here during the compression kinetic energy is converted into elastic potential energy

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