試題詳解

24. A 1.0-kg block and a 2.0-kg block are pressed together on a horizontal frictionless surface with a compressed very light spring between them. They are not attached to the spring. After they are released and have both moved free of the spring
(A) both blocks will have equal speeds.
(B) the magnitude of the momentum of the heavier block will be greater than the magnitude of the momentum of the lighter block.
(C) the lighter block will have more kinetic energy than the heavier block.
(D) the heavier block will have more kinetic energy than the lighter block.
(E) both blocks will both have the same amount of kinetic energy.