A sack of flour of mass m is lifted vertically at a constant speed of v through a height of h.

Part A)
How great a force is required? Take the free fall acceleration to be g _____ N
Part B)
How much work is done on the sack by the lifting force? Take free fall acceleration to be g ____ J
Part C)
What becomes of this work
-This work becomes kinetic energy.
-This work becomes potential energy.
-This work becomes both kinetic and potential energy
-This work becomes heat.