At a certant of time the mass of a roket going up vertically is 100kg. If it is ejecting 5kg of gas per second at a speed of `400m//s`, the acceleration of the rocket would be `("talking" `g=10m//s^(2))`

Options

A. `20m//s^(2)`
B. `10m//s^(2)`
C. `2m//s^(2)`
D. `1m//s^(2)`

Answer

B

Explanation

The acceleration of a rocket is given by
`a=(v)/(m)((Deltam)/(Deltat))-g=(400)/(100)((5)/(1))-10` .
`=(20-10)=10m//s^(2)` .