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  4. A cracker rocket is ejecting gases at a rate of 0.05 kg / s with a velocity 400 m / s. The accelerating force on the rocket is

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Q. A cracker rocket is ejecting gases at a rate of $0.05\, kg / s$ with a velocity $400\, m / s$. The accelerating force on the rocket is

Laws of Motion

Solution:

For a variable mass system
$F =\frac{v d m}{d t}$
$=400 \times 0.05=20\, N$