A rocket with a lift-off mass $3.5 \times {10^4}\,\,kg$ is blasted upwards with an initial acceleration of $10m/{s^2}.$ Then the initial thrust of the blast is
$3.5 \times {10^5}N$
$7.0 \times {10^5}N$
$14.0 \times {10^5}N$
$1.75 \times {10^5}N$
Solution
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