A 600 kg rocket is set for a vertical fliring. If the exhaust speed is `100 m//s`, the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is

Options

A. `117.6 kgs^(-1)`
B. `58.6 kgs^(-1)`
C. `6 kgs^(-1)`
D. `46.4 kgs^(-1)`

Answer

C

Explanation

Thrust `=u(dm)/(dt) = Mg`
`"or "(dm)/(dt)=(Mg)/(u)=(600 xx 9.8 )/(1000) = 6 kgs^(-1)`