If the coefficient of kinetic friction is .25, how much horizontal force is needed to pull each of the following masses along a rough desk at a constant speed?

Question

a. 25 kg
b. 15 kg
c. 250 g

explain please!!

Answer 1

force friction=mu*m*g

at constant velocity, the pushing force is exactly equal to the force of friction, so
pushingforce=mu*mass*accelerationgravity

Answer 2

thanks!!!