A body of mass m moving with a constant veloc | vedclass

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(C) According to the law of conservation of linear momentum,the total momentum of the system remains constant if no external force acts on it.Initial

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(C) According to the law of conservation of linear momentum,the total momentum of the system remains constant if no external force acts on it.Initial momentum of the system = $m(v) + m(-v) = mv - mv = 0$.Let the final velocity of the combined mass be $V$.Since the bodies stick together,the final mass of the system is $m + m = 2m$.Final momentum of the system = $(2m)V$.By the law of conservation of momentum: Initial momentum = Final momentum.$0 = 2mV$.Therefore,$V = 0$.

$A$ body of mass $m$ moving with a constant velocity $v$ hits another body of the same mass moving with the same velocity $v$ but in the opposite direction and sticks to it. The velocity of the compound body after collision is

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