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A rocket of mass $8000 k g$ is set for vertical firing. If the exhaust speed is $1 k m s^{- 1}$ . The rate of mass of gas ejected to supply a thrust needed to give the rocket an initial upward acceleration of $10.2 m / s^{2}$ is

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detailed solution

Correct option is B

M(g+a)=udmdt 8000(9.8+10.2)=1000dmdt dmdt=8×20=160

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A rocket of mass 8000kg is set for vertical firing. If the exhaust speed is1kms–1 . The rate of mass of gas ejected to supply a thrust needed to give the rocket an initial upward acceleration of 10.2 m/s2 is

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A rocket of mass $8000 k g$ is set for vertical firing. If the exhaust speed is $1 k m s^{- 1}$ . The rate of mass of gas ejected to supply a thrust needed to give the rocket an initial upward acceleration of $10.2 m / s^{2}$ is