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A variable mass body with an initial mass of 5 kg is moving with a velocity of 5 m/s initially, after some time the velocity increases to 10 m/s, what is the new mass if the body is moving in the absence of any external force?(a) 2.5 Kg(b) 5 Kg(c) 7.5 Kg(d) 10 KgI have been asked this question during a job interview.I would like to ask this question from Laws of Motion topic in portion Laws of Motion of Physics – Class 11

Answer»

The correct choice is (a) 2.5 Kg

For explanation I would SAY: The body is moving in the absence of any EXTERNAL force THUS the momentum remains conserved.m1v1 = m2v2. v1 = 5 m/s, m1 = 5 Kg, V2 = 10 m/s. On solving, we get, m2 = 2.5 kg. Hence, the correct ANSWER is 2.5 Kg.



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