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A block of mass 2 kg, slides down a roug...

A block of mass 2 kg, slides down a rough inclined plane of length I rn and inclination 60°. The coefficient ofkinetic friction is 0.4. What is the work done against friction, when it slides from the top to the bottom?

A

2.5 J

B

1.25 J

C

3.25 J

D

3.92 J

Text Solution

Verified by Experts

The correct Answer is:
D
Force of friction`=muR=mumgcostheta`
`:.` Work done against friction,
W=Frictional force`xx`Displacement
`=mumgcosthetaqxxl`
`=0.4xx2xx9.8xx1/2xx1=3.92J`
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