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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=FNetm=Ft−mgm
Ft=mg+ma=104×10+104×2=12×104=120 kN

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