A5000kg rocket is set for vertical firing. The exhaust speed is 800m/s. To give an upward acceleration of 20m/s2 the amount of gas ejected per second to supply the needed thrust is
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Acceleration = Change in velocity / Time
Change in speed = Final velocity - initial velocity
Change in speed = 800 - 0 = 800 m/s
20 = 800 / t
20t = 800
t = 40 seconds
In 40 seconds 5000 kg is ejected.
How much can be ejected per second is :
5000 / 40 = 125 kg per second
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