a box weighing 800n is dragged across a level floor at a constant speed under the influence of a 60n applied force.What is the coefficient of sliding friction between the box and the floor?

Answer 1

M*g = 800 N. = Normal(Fn).

Fap-Fk = M*a.
60-u*800 = M*0 = 0.
u*800 = 60.
u = 0.075.