A 145 g ball, initially at rest is dropped from a 0.553 km tall building. Answer the following questions.

a. What is the total energy of the ball relative to the ground before it is dropped?

b. Assuming no energy loss, what is the speed of the ball when it is halfway down the tower? You must derive a symbolic equation to calculate the speed, and then sub in known values. I will give you the starting point.

c. The actual speed of the ball the moment before it hits the ground is 68 m/s. Calculate the efficiency of the drop. What is one possible source of energy loss?