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Q.

A rocket with a lift off mass $3.5 \times 10^{4} k g$ is blasted upwards with an initial acceleration of $10 m / s^{2} .$ Then the initial thrust of the blast is

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a

$1.40 \times 10^{5} N$

b

$7 \times 10^{5} N$

c

$3.5 \times 10^{5} N$

d

$1.75 \times 10^{5} N$

answer is C.

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Detailed Solution

detailed_solution_thumbnail

Net force F = T-mg

T = F + mg = ma + mg = m (a + g)

= ( 10 + 10 ) $3.5 \times 10^{4}$

$= 20 \times 3.5 \times 10^{4}$

$= 70 \times 10^{4} = 7 \times 10^{5} ............... (3)$

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A rocket with a lift off mass 3.5×104kg is blasted upwards with an initial acceleration of 10m/s2. Then the initial thrust of the blast is