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Q.

A rocket with a lift – off mass 10000kg is blasted upwards with an initial acceleration of 2m /s² . The initial thrust of the blast is

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a

80 kN

b

140 kN

c

120 kN

d

100 kN

answer is A.

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Detailed Solution

$a = \frac{F_{Net}}{m} = \frac{F_{t} - mg}{m}$
$F_{t} = mg + ma = 10^{4} \times 10 + 10^{4} \times 2 = 12 \times 10^{4} = 120 kN$

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A rocket with a lift – off mass 10000kg is blasted upwards with an initial acceleration of 2m /s2 . The initial thrust of the blast is