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Which of the following is the correct formulation for the second law of motion?(a) F = m(dv/dt)(b) F = ma(c) F = v(dm/dt) + ma(d) F = mv^2The question was asked in an interview for internship.My question is based upon Laws of Motion Basics in portion Laws of Motion of Physics – Class 11

Answer»

Right answer is (c) F = v(dm/dt) + ma

To EXPLAIN I would say: The second law of motion states that the net force applied on a body is EQUAL to the rate of change of momentum. Hence, F = dp/dt. p = mv. THEREFORE, F = m(dv/dt) + v(dm/dt) = v(dm/dt) + ma.



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