16) A rocket of initial mass 1000 kg adjusts its thrust by varying the rate of mass ejection. The ejection speed relative to the rocket is 40 km / s. If the acceleration of the rocket must have a magnitude of 20 m / s2 at an instant when its mass is 80% of the original mass, at what rate is it being ejected at this instant? Ignore any forces external to the rocket. Answers: a) 0.40 kg/s       b) 0.50 kg/s        c) 0.60 kg/s     d) 0.70 kg/s         e) 0.80 kg/s

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: