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[" A rockethas a mass of "100kg.90%" of ...

[" A rockethas a mass of "100kg.90%" of this is "],[" fuel,It ejects fuel vapours at the rate of "1],[kg/sec" with a velocity of "500m/sec" relative to "],[" the rocket.It is supposed that the rocket is "],[" ontside the gravitational field.The initial upthrust "],[" on the rocket when it just starts moving upwards "],[[" (1) Zero "," (2) "500N],[" (3) "1000N," (4) "2000N]]

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