When playing hockey, you flick the puck across the ice rink with your stick. The puck then moves across the frictionless surface of the ice at constant velocity. As the puck moves across the ice, its kinetic energy is
A. constant because kinetic energy is a conserved quantity.
B. zero because it isn't accelerating.
C. increasing as the ice does work on it to support it against the force of gravity.
D. constant because its speed is constant.
Answer:D
When playing hockey, you flick the puck across the ice rink with your stick. The puck then moves across the frictionless surface of the ice at constant velocity. As the puck moves across the ice, its kinetic energy is
A. constant because kinetic energy is a conserved quantity. B. zero because it isn't accelerating. C. increasing as the ice does work on it to support it against the force of gravity. D. constant because its speed is constant.