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/s2 . [Exhaust speed of fuel = 980 m/s.]. (1) 240 kg s –1  (2) 60 kg s –1  (3) 120 kg s –1  (4) 130 kg s –1 

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