A rocket with a lift- off mass $3.5 \times {10^4}$$kg$ is blasted upwards with an initial acceleration of $10m/{s^2}.$ Then the initial thrust of the blast is
$1.75 \times {10^5}N$
$3.5 \times {10^5}N$
$7.0 \times {10^5}N$
$14.0 \times {10^5}N$
A rocket with a lift- off mass $3.5 \times {10^4}$$kg$ is blasted upwards with an initial acceleration of $10m/{s^2}.$ Then the initial thrust of the blast is
Initial thrust must be
$m\,[g + a] = 3.5 \times {10^4}(10 + 10) = 7 \times {10^5}N$
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