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
the lighter block will have more kinetic energy than the heavier block.
the magnitude of the momentum of the heavier block will be greater than the magnitude of the momentum of the lighter block.
the heavier block will have more kinetic energy than the lighter block.
both blocks will both have the same amount of kinetic energy.
both blocks will have equal

Question

anonymous · Answer

Sorry. Completely disregard that.

Because the velocity of the 1.0kg block will be greater than the 2.0kg block, the lighter block will have greater kinetic energy.

alfie · Answer

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Now think about all the answers and formulas.
1/2mv^2 is related to the weight, are they both the same weight? Nope... what does this tell us?