A block of mass m = 4.00 kg starts from rest at the top of a ramp that is inclined at an angle
of 25.0◦ with the horizontal. The coefficient of kinetic friction between the block and the ramp is
μk = 0.250. The block slides 3.00 m down the ramp, at which point it is at the bottom of the ramp.
a) What is the work done by gravity on the block?
a) Calculate the gravitational potential energy of the block before it is released, taking the top of the uncompressed spring as the reference position (where y = 0).