quantity of motion contained in a body is?
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The quantity of motion contained in a body is known as the velocity.
KartikSharma13:
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It's true that momentum is always associated with motion of something, but momentum is not a measure of the motion unless all of the things moving have exactly the same mass. The oddity is that photons have momentum, but they all move at the same speed in a vacuum. Yet their momenta are not the same. The momentum of a photon is proportional to its frequency and inversely proportional to its wavelength.
Motion is not contained in anything. Motion in the context of momentum is the speed and direction that something is moving relative to an observer or a frame of reference.
Momentum is an absolutely conserved quantity that is associated with motion. It also has direction. A car moving north at a certain speed has different momentum from a car moving east at the same speed. It is not defined by any formula. However there is one equation from which the momentum of any particle can be determined whether or not it has mass: energy momentum relation
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