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Energy - Force and Work

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A 90g bullet is fired from a rifle having a barrel 0.690m long. Assuming the origin is placed the bullet begins to move, the force (in newtons) exerted on the bullet by the expanding gas is 1000 + 6000x- 35000x*x where x is in meters.

a) Determine the work done by the gas on the bullet as the bullet travels the length of the barrel (in kJ)
b) If the barrel is 1.15m long, how much work is done and how does this value compare to the work calculated in part(a)_____kJ
_______(work done with 1.15m barrel/work done with te 0.690m barrel)

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