Question

In a rocket of mass $1000kg$ fuel is consumed at a rate of $40kg^{- 1}s.$ The velocity of the gases ejected from the rocket is $5\times 10^{4}ms^{- 1}.$ The thrust on the rocket is:-

• A. $2\times 10^{3}N$
• B. $5\times 10^{4}N$
• C. $2\times 10^{6}N$
• D. $2\times 10^{9}N$

Answer 1

Answer: (C)

$F=V_{r}\cdot \frac{d m}{d t}=5\times 10^{4}\times 40$
$F=2\times 10^{6}$