Please solve my problem.A rocket is ejecting 50 g gas at a velocity of 400m/s.Find the accelerating force of the rocket?

Dear Dhruv,

In variable mass systems this force is called Thrust Force which the ejecting particles put on the original system and is equal to v_reldm/dt where v_rel is relative speed of ejecting partiles wrt original system. If you calculate dm/dt from v_rel, you get dm/dt = ρAv_rel where ρ is density of gas and A is area of cross section from where gas is ejecting. Anyway the question is ill formed. I would advise you to stick to standard books and not source your questions from doubtful sources and waste your time.

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Gokul  Joshi