A 50 ampere-hour, 12 volt battery contains stored energy when it is
 fully charged.

• If the current flowing from the battery is 20 amperes, what is the power being delivered by the battery?
• How much total energy (joules) can be supplied by a fully charged battery?
• How high will this battery be able to lift a 150 pound person if the battery is fully charged and all of the energy in the battery goes into potential energy in raising the person.  Give your answers both in meters and feet.