A block of mass 100 kg slides over a distance of 10 m on a horizontal surface. If the co-efficient of friction between the surfaces is 0.4, then the work done against friction (in J) is :

(1) 4200 

(2) 3900 

(3) 4000 

(4) 4500

                                        JEE-2024       

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

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