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  4. A 6000 kg rocket is set for firing. If the exhaust speed is 1000 m / s, how much gas must be ejected each second to supply the thrust needed to overcome the weight of the rocket?

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Q. A $6000\, kg$ rocket is set for firing. If the exhaust speed is $1000\, m / s$, how much gas must be ejected each second to supply the thrust needed to overcome the weight of the rocket?

Laws of Motion

Solution:

$F=v \frac{d m}{d t}=m g$
$1000\left(\frac{d m}{d t}\right)=60000$
$\frac{d m}{d t}=60\, kg$