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A rocket has a mass of 100 kg . 90% of t...

A rocket has a mass of 100 kg . `90%` of this is fuel. It ejects fuel vapours at the rate of `1 kg//sec` with a velocity of 500 `m//sec` relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is

A

zero

B

500 newton

C

1000 newton

D

2000 newton

Text Solution

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The correct Answer is:
B
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