A 0.32-(F capacitor is charged by a 1.5-V battery. After being charged, the capacitor is connected to

Question:

A 0.32-(F capacitor is charged by a 1.5-V battery. After being charged, the capacitor is connected to a small electric motor. Assuming 100% efficiency,
(a) To what height can the motor lift a 7.5-g mass?
(b) What initial voltage must the capacitor have if it is to lift a 7.5-g mass through a height of 1.0 cm?