Laws Of Motion Question 199

Question: A rocket has an initial mass of $ 20\times 10^{3}kg $ . If it is to blast off with an initial acceleration of $ 4m{{s}^{-2}} $ , the initial thrust needed is $ (g\tilde{=}10m{{s}^{-2}}) $ [Kurukshetra CEE 1996]

Options:

A)$ 6\times 10^{4}N $

B) $ 28\times 10^{4}N $

C) $ 20\times 10^{4}N $

D) $ 12\times 10^{4}N $

Show Answer

Answer:

Correct Answer: B

Solution:

$ F=m(g+a)=20\times 10^{3}\times (10+4)=28\times 10^{4}N $



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