Why do we have different measures of energy?

Hey everyone,

                       Im stuck trying to do my P.E homework. Im having to answer questions on energy and body and I had to write about calories, joules, kilocalories and kilojoules which was easy enough. However I now have to answer 'Why are the different measures needed?' I sort of understand why but I cant get it to make sense when I write it. Any ideas? cheers xXx
Answer #1

Write what you think and justify it. Explain what you mean,

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