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A 6000 kg rocket is set for vertical firing. If the exhaust speed is 1000ms1 , the amount of gas that must be ejected per second to supply the thrust needed to overcome the weight of the rocket is (g=10ms1)

a
30 kg
b
60 kg
c
75 kg
d
90 kg

detailed solution

Correct option is B

M0g=  Thrust =vdMdt ⇒dMdt=M0gv ⇒dMdt=600001000=60kgs−1

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