1. a hockey puck sliding on a frictionless 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 loses some, but not all, of its original momentum and mechanical energy. b. the puck conserves its original momentum and mechanical energy. c. one cannot determine if the momentum or energy of the puck is conserved without knowing the final velocities and masses of the two objects. d. the puck conserves its original momentum, but loses some, but not all, of its mechanical energy. e. the puck loses some momentum in the collision but conserves its mechanical energy. f. the puck conserves its original momentum but loses all of its mechanical . which of the following describes the change in momentum and energy of the combined puck and box during the collision? a. the system conserves its original momentum but loses all of its mechanical energy. b. one cannot determine if the momentum or energy of the system is conserved without knowing the final velocities and masses of the two objects. c. the system loses some, but not all, of its momentum and mechanical energy. d. the system conserves its original momentum and mechanical energy. e. the system conserves its original momentum, but loses some, but not all, of its mechanical energy. f. the system loses some momentum in the collision but conserves its mechanical energy.