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Q.

A bird of mass 0.1 kg rising vertically with an acceleration 0.2 ms-2. The muscular force exerted by it is (g = 9.8 ms-2) a) 1 Newton      b) 9.8 kg.wt      c) 1/9.8 kg.wt     d) 980 newtons.

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a

a is correct

b

a and c are correct

c

a and b are correct

d

b and d are correct

answer is C.

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Detailed Solution

The muscular force must overcome the gravitational force and also give the bird an acceleration of 0.2ms-2.

F=m(g+a)=0.1(9.8+0.2)=1N=1/9.8kg.wt

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