A block of mass 1 kg slides down a rough...

A block of mass 1 kg slides down a rough inclined plane of inclination `60^(@)` starting from its top. If coefficient of kinetic friction is 0.5 and length of the plane d=2 m, then work done against friction is

2.45 J

4.9 J

9.8 J

19.6 J

Text Solution

Verified by Experts

The correct Answer is:

(b) Work done against friction `=(mu mg cos theta )d`
`=0.5xx1xx9.8xxcos60^(@)xx2=4.9J`

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