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(A) When objects are released from height $h$ under gravity,they undergo free fall.According to the equations of motion,the final velocity $v$ just be

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(A) When objects are released from height $h$ under gravity,they undergo free fall.According to the equations of motion,the final velocity $v$ just before striking the ground is given by $v = \sqrt{2gh}$.Since $g$ and $h$ are the same for all objects,the velocity $v$ is the same for all objects regardless of their mass.However,the momentum $p$ of an object is given by $p = mv$.Since the masses $m$ of the five objects are different,their momenta $p$ will be different at the instant they strike the ground.Therefore,the physical quantity that depends on the mass and changes for different objects is momentum.

Five objects of different masses are simultaneously released vertically downwards from height $h$ (in air). Which physical quantity associated with the objects will change at the instant they strike the ground? (Neglect the air resistance.)

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