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Q.

A rocket of mass 10,000 kg is set for vertical firing. If the exhaust speed of the gases is 2000 m/s, find the rate at which the gas must be ejected to supply the thrust needed. [g=10 ms−2]

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a

10 kg/s

b

20 kg/s

c

40 kg/s

d

50 kg/s

answer is D.

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Detailed Solution

Mg=Vr(dmdt)

10,000×10=2000×(dmdt)

(dmdt)=50 kg/s

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