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Solution


Q.

A block of mass 100 kg slides over a distance of 10 m on a horizontal surface. If the coefficient of friction between the surfaces is 0.4, then the work done against friction (in J) is       [2024]
1 4200  
2 3900  
3 4000  
4 4500  

Ans.

(3)

Given m=100kg, μ=0.4

Friction force, f=μmg=0.4×100×10=400N

Now W=f·s=400×10=4000J