Question

what is meaning of dm and dt in physics?​

Answer 1

Answer: In words, the net force acting on an object causes its momentum to change. If the net force is zero, the momentum does not change, it is conserved. d(mv)/dt = v dm/dt + m dv/dt = v dm/dt + m a. If the mass of the object is constant, dm/dt = 0 so d(mv)/dt = m a and the two versions of Newton's second law are equivalent.

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