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Solution


Q.

A heavy box of mass 50 kg is moving on a horizontal surface. If the coefficient of kinetic friction between the box and the horizontal surface is 0.3, then the force of kinetic friction is          [2024]
1 1.47 N  
2 14.7 N  
3 1470 N  
4 147 N  

Ans.

(4)

Given m=50 kg, μk=0.3        

fk=μkN=μkmg=0.3×50×9.8=147 N