Laws of Motion

Question: A 5000 kg rocket is set for vertical firing. The exhaust speed is $800\,m{s^{ - 1}}$. To give an initial upward acceleration of $20\,m{s^{ - 2}}$, the amount of gas ejected per second to supply the needed thrust will be $(g = 10\,m{s^{ - 2}})$

1) $127.5\,kg\,{s^{ - 1}}$

2) $187.5\,kg\,{s^{ - 1}}$

3) $185.5\,kg\,{s^{ - 1}}$

4) $137.5\,kg\,{s^{ - 1}}$

Solution:

Explanation: No Explanation

Second Law of Motion NLM

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