A cord is used to vertically lower an initially stationary block of mass M = 40 kg at a constant downward acceleration of g/3. When the block has fallen a distance d = 1.5 m.
a) Find the work done by the cord's force on the block.
b) Find the work done by the gravitational force on the block.
c) Find the kinetic energy of the block.
d) Find the speed of the block.