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which of the following statements about the work done by a force is true?
the work done by gravity on an elevator going down is positive
two objects of different mass have equal, non-zero kinetic energies. Which object has the greater magnitude of momentum?
the heavier object
Consdier a uniform hoop of radius R and mass M rolling without slipping. Which is larger, its translational kinetic energy or its rotational kinetic energy?
both are equal
When is the average velocity of an object equal to the instantaneous velocity?
when the velocity is constant
