1. A 12.0 - kg package in a mail-sorting room slides 2.00 m down a chute that is inclined at 53.0' below the horizontal. The coefficient of kinetic friction between the package and the chute's surface is 0.40. What is the net work done on the package? 2. A 4.80 - kg watermelon is dropped from rest from the roof of an 18.0 - m-tall building and feels no appreciable air resistance. Calculate the work done by gravity on the watermelon during its displacement from the roof to the ground. 3. A spring of negligible mass has a force constant k = 800 N/m. How far must the spring be compressed for 1.20 J of potential energy to be stored in it