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Solution


Q.

Statement – I: Work done by friction on a body sliding down an inclined plane is always positive.

Statement – II: Work done is greater than zero, if angle between force and displacement is acute.
1 Both statement I and statement II are correct  
2 Statement I is incorrect and statement II is correct  
3 Statement I is correct and statement II is incorrect  
4 Both statement I and statement II are incorrect  

Ans.

(2)

Work done by friction on inclined plane will be negative

W=Fscosθ=+ve, if θ<90°.