Question

A rocket is going upwards with accelerated motion. A man sitting in it feels his weight increased 5 times his own weight. If the mass of the rocket including that of the man is $ 1.0 \times 10^{4} \,kg,$ how much force is being applied by rocket engine? (Take $\,g =10\, m\, s^{-2}$)

• A. $5\times10^{4} $ $N$
• B. $5\times10^{5}$ $N$
• C. $5\times10^{8}$ $N$
• D. $2 \times10^{4}$ $N$

Answer 1

Answer: (B)

As the weight of man increases by 5 times, so acceleration of the rocket, $a=5\, g$ $=5\times10$ $=50\,m \,s^{-2}$ Force applied by rocket engine is
$F=ma$ $=1.0\times10^{4}\times50$ $=5\times10^{5} N$