A hockey puck sliding on a friction surface strikes a box at rest. After the col

Question

A hockey puck sliding on  a friction surface strikes a box at rest. After the collision, the two objects stick together and move at some final speed, which of the following describes the change in momentum   and energy of the puck during the collision ?

a)  the puck conserves its original momentum and mechanical energy

b) the puck conserves its original momentum, but loses all of its mechanical energy

which of the following describes the change in momentum and energy of the combination puck and box during the collision?

a) the system conserves its original momentum, but loses all of its mechanical energy

b) the system conserves its original momentum, and mechanical energy

Explanation / Answer

the puck loses some but not all of the momentum and mechanical energy

the system conserves its momentum but loses some but not all of its mechanical energy

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