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 xx 10^4 kg`, how much force is being applied by rocket engine? (Take, `g = 10 ms^(-2)`).
Options:
(a) `5 xx 10^4 N`
(b) `5 xx 10^5N`
(c) `5 xx 10^8 N`
(d) `2 xx 10^4N`