A rocket has an initial mass of 20×103kg.If it is to blast off with an initial acceleration of 4 ms−2.the initial thrust needed is g2=10ms−2

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6×104N

28×104N

20×104N

12×104N

answer is B.

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Detailed Solution

F=m(g+a)=20×103×(10+4)=28×104N

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