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A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms-1. To give an initial upward acceleration of 20 ms-2, the amount of gas ejected per second to supply the needed thrust will be (g = 1
(a) 127.5 kgs-1
(b) 187.5 kgs-1
(c) 185.5 kgs-1
(d) 137.5 kgs-1
(b)
Þ
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