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:

Step-by-step solution

Given m = 100 kg s = 10 m μ = 0 . 4 The frictional force is given by f = μ m g = 0 . 4 × 100 × 10 = 400 N So, the work done by the force can be calculated as follows: W = f × s = 400 × 10 = 4000 J