A body of mass 25 kg is at rest on a horizontal surface. Minimum horizontal force required to just start motion is 73.5N and a force of 49N is needed to keep the body movingwith a constant velocity. What is the coefficient of (i) static friction and (ii) kinetic friction ?

A body of mass 25 kg is at rest on a horizontal surface. Minimum horiz

1.	A body of mass 25 kg is at rest on a horizontal surface. Minimum horizontal force required to just start motion is 73.5N and a force of 49N is needed to keep the body movingwith a constant velocity. What is the coefficient of (i) static friction and (ii) kinetic friction ?
Answer» Solution :`m=25kg` Coefficient of static FRICTION `=mu_(s)=("Limiting friction")/(mg)=(7.5)/(25xx9.8)=0.3` Coefficient of kinetic friction `=mu_(K)=(49)/(25xx9.8)=0.2`