Question

a body of mass 10 kg is pushed throug a distance of 5 metre across the floor with constant speed if the friction force attract by the by the floor is 25 Newton find work done by the frictional force​

Answer 1

STEP BY STEP EXPLANATION

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As the frictional force is acting opposite to the direction of the motion of the block, it is making an angle of 180 degree..

s= 5 metre

Work done, W = F.s.cosθ

= 25×5× cos180

= -125 (cos180= -1)

HENCE the work done is -125 J

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Answer 2

Answer:

Here the answer is - 125

work done = F.s costheta

cos teta = 180°=-1

25×5×-1 = -125J

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