A rocket is going upward with acceleration motion. A man string in it feels his weight increased 5 time his own weight. If the mass of the rocket including that of the man is `1.0xx10^(4)kg` , how much force is being applied by rocket engine? `(Take g=10ms^(-2))` .
A. `5xx10^(4)N`
B. `5xx10^(5)N`
C. `5xx10^(8)N`
D. `2xx10^(4)N`