A Diwali rocket is ejecting $0.05 k g$ of gases per second at a velocity of $400 m s^{- 1}$ . The repulsive force on the rocket is

20 dyne

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20 newton

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20 kgwt

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Sufficient data not given

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Solution

The correct option is B 20 newton
the force is such case is $v_{r e l} \frac{d m}{d t}$ = 400 x 0.05N = 20 N

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