A box of the mass 40 kg is kept on a floor. Sanjay is trying to push it from the left and Harsh is trying to push it from the right. The force exerted by them are 25 N and 35 N respectively. However, the box remains stationary on the floor. Find the force of friction acting on the box.

As you see in the below figure,

Force directing towards right=25 N

Force directing towards left=35 N

So the net force acting on the box should be=35-25 =10N(towards left)

 

But according to question box is stationary.It means a friction force of 10 N is acting towards right.

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