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  4. A rocket with a lift-off mass 20000 kg is blasted upwards with an initial acceleration of 5 ms -2. the initial thrust of the blast is

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Q. A rocket with a lift-off mass $20000 \,kg$ is blasted upwards with an initial acceleration of $5\, ms ^{-2}$. the initial thrust of the blast is

Laws of Motion

Solution:

$F-m g=m a$
$\Rightarrow F=m(g+a)=(20000\, kg )(10+5) ms ^{-2}$
$=3 \times 10^{5} N$