A sack of flour of mass m is lifted vertically at a constant speed of v through a height of h.
A) How great a force is required? Take the free fall acceleration to be g
.......N
B) How much work is done on the sack by the lifting force? Take free fall acceleration to be g
......J
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.
