write the law of conservation of momentum and prove it explain in short
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State and prove law of conservation of momentum. Law of conservation of momentum states that totalmomentum of system remains conserved in the absence of external force. Proof: ... Galileo's law of motion states that, a body continues to move in the same direction with constant speed, if no force is acting on the body.
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Conservation of momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant. Momentum is equal to the mass of an object multiplied by its velocity and is equivalent to the force required to bring the object to a stop in a unit length of time. For any array of several objects, the total momentum is the sum of the individual momenta. There is a peculiarity, however, in that momentum is a vector, involving both the direction and the magnitude of motion, so that the momenta of objects going in opposite directions can cancel to yield an overall sum of zero.
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