Energy to a 40% efficient engine

[laxmanic33]

Homework Statement

A 40%-efficient car engine accelerates the 1200 kg car from rest to 18 m/s.
How much energy is transferred to the engine by burning gasoline?

any help is appreciated

 

[cepheid]

1. How much work is done by the engine?
2. Is all of the engine's energy being used to do that work? No, because the engine is not 100% efficient.
3. So how much energy must be released by burning in order for the engine to be able to do the amount of work calculated in (1) after 60% of said energy is thrown away?