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A particular 12-volt car battery has a rating of 45 $A\cdot h$ (ampere-hours). This means that it can supply 45 amperes for 1 hour and 15 amperes for 3 hours etc.
Assuming the internal resistance is negligible, what is the total energy this battery can supply? Determine the energy in MJ (mega Joules), do not enter any units in the answer box.