When a forklift raises an object, is it doing positive or negative work on the object? Which type of work is the
force of gravity doing on the object? Explain your answers.

This is not a math problem, this is physics.

The

-> When the forklift raises an object, it is doing positive work. This is because electrical energy is converted in to kinetic energy that is required for the forklift to raise the object.

-> However the resultant force of the object reacts on to the forklift, causing force of drag. This slightly weighs the forklift downwards due to how much mass the object weighs.