A rocket with a lift-off mass `3.5 xx 10^(4) N` kg is blasted upward with an initial acceleration of `10 m//s^(2)`. Then the initial thrust of the blast is:

Options

A. `1.75 xx 10^(5) N`
B. `3.5 xx 10^(5) N`
C. `7.0 xx 10^(5) N`
D. `14.0 xx 10^(5) N`

Answer

c

Explanation

Here thrust on the rocket is `F= m (g + a)`
`= 3.5 xx 10^(4) (10 + 10) = 70 xx 10^(4) = 7.0 x 10^(5)N`
Hence choice is (C).