The pulley has a radius of 15 cm and a mass of 350 grams. The 100 gram box is released from rest. As it falls 80 cm, it causes the pulley to rotate. a. How much gravitational potential energy did the box lose as it fell 80 cm?

b. What is the rotational inertia of the pulley?

c. What is the speed of the box after it has descended 80 cm?

d. What is the angular speed of the pulley?

e. How much rotational kinetic energy does the pulley have?