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A rocket of mass 4000 kg is set for vert...

A rocket of mass 4000 kg is set for vertical firing. How much gas must be ejected per second so that the rocket may have initial upwards acceleration of magnitude `19.6 m//s^(2)` ? [Exhaust speed of fuel`=980 m//s`]

A

`240 kg s^(-1)`

B

`60 kg s^(-1)`

C

`120 kg s^(-1)`

D

`20 kg s^(-1)`

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