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  4. In a rocket, fuel burns at the rate of 2 kg / s. This fuel gets ejected from the rocket with a velocity of 80 km / s. Force exerted on the rocket is

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Q. In a rocket, fuel burns at the rate of $2\, kg / s$. This fuel gets ejected from the rocket with a velocity of $80\, km / s$. Force exerted on the rocket is

Laws of Motion

Solution:

For variable mass system $F=\frac{u d m}{d t}$
$=80 \times 10^{3} \times 2=1,60,000\, N$