A block of mass 15 kg slides down a line of greatest slope of an inclined plane. The top of the plane is at a vertical height of 1.6 m above the level of the bottom of the plane. The speed of the block at the top of the plane is 2 m/s^-1 and the speed of the block at the bottom of the plane is 4 m/s^-1.

Find the work done against the resistance to motion of the block.