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A rocket has an initial mass of $20 \times 10^3 \mathrm{~kg}$. If it is to blast off with an initial acceleration of $4 \mathrm{~ms}^{-2}$, the initial thrust needed is $\left(g \cong 10 \mathrm{~ms}^{-2}\right)$
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$28 \times 10^4 \mathrm{~N}$
$\begin{aligned} & \mathrm{F}=\mathrm{m}(\mathrm{g}+\mathrm{a}) \\ & =20 \times 10^3(10+4) \\ & =28 \times10^4 \mathrm{~N}\end{aligned}$
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