A person of mass 75 kg works in a store where his job is to arrange heavy articles in a store-room. As shown in figure, he places a package of mass 20 kg on a ramp that is inclined to the horizontal at 37^o and pushes it up the ramp with an acceleration 1.5 m s^-2. This is the minimum acceleration for the package to reach the top of the ramp.

The coefficient of static friction between the shoes of the person and the ground is 0.8 and coefficient of kinetic friction for the motion of package on the ramp is 0.5.