1. A rope is used to vertically lower a block of mass M with a constant downward acceleration of g/2. (Note that the block was initially at rest). The block has moved from its initial position with a displacement d.

a. Find the work done by the cord's tension 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.







2. A rescuer attached to a cable on a helicopter lifts up a 75-kilogram man 20 meters vertically. The man has an acceleration of 2.5m / (s ^ 2)

a. What is the work done on the man from the
helicopter/rescuer?
b. What is the work done by the gravitational force on the man?

c. What is the kinetic energy of the man?

help me guys please!:(

d. Calculate the speed of the man.​