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A rocket with a lift off mass $20,000 \mathrm{~kg}$ is blasted upwards with an initial acceleration of $5.0 \mathrm{~ms}^{-2}$. Calculate the initial thrust (force) of the blast.
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Here, $m=20000 \mathrm{~kg}, a=5 \mathrm{~ms}^{-2}$
The thrust should be such that it overcomes the force of gravity besides giving it an upward acceleration of $5 \mathrm{~ms}^{-}$ 2. Thus the force should produce a net acceleration of $9.8+5.0=14.8 \mathrm{~ms}^{-2}$.
As thrust $=$ force $=$ mass $\times$ acceleration.
$\therefore$ force, $F=20000 \times 14.8=2.96 \times 10^5 \mathrm{~N}$.
The thrust should be such that it overcomes the force of gravity besides giving it an upward acceleration of $5 \mathrm{~ms}^{-}$ 2. Thus the force should produce a net acceleration of $9.8+5.0=14.8 \mathrm{~ms}^{-2}$.
As thrust $=$ force $=$ mass $\times$ acceleration.
$\therefore$ force, $F=20000 \times 14.8=2.96 \times 10^5 \mathrm{~N}$.
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