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A rocket of mass 5000kg is set for vert...

A rocket of mass 5000kg is set for vertical firing.If the exhaust speed be 800m/s ,then how much gas must be ejected to give the rocket an upward acceleration of 10m/`s^(2)` (Take g=10m/`s^(2)`)
(A) 50kg/s

(B) 100kg/s

(C) 125kg/s

(D) 10kg/s

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