A rocket with a lift- off mass 3.5 ×10^4kg

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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

A

$1.75 \times {10^5}N$

B

$3.5 \times {10^5}N$

C

$7.0 \times {10^5}N$

D

$14.0 \times {10^5}N$

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

$m\,[g + a] = 3.5 \times {10^4}(10 + 10) = 7 \times {10^5}N$