name the two factors on which the force needed to stop a moving body in a given time ,depends.
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nature of the surface and force applied on body
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Force is the rate of change of momentum and momentum is mass times velocity. So the time a force takes to stop a body moving with a constant velocity depends upon the mass and it's velocity ( or their product which is the momentum ). In fact a momentum can be defined as a measure of the time a given forces takes to stop the moving object.
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