Question

A box weighing 20 kg is pushed along the floor at a constant speed by applying a horizontal force. If the coefficient of friction is 0.25, then force applied is:

• A. 5 N
• B. 10 N
• C. 50 N
• D. 200 N

Answer 1

Answer: (C)

50 N

Here the required force should be the frictional force.

Thus, $F=f=\mu mg=0.25\times 20\times 10=50N$