Physics: Work theorum related?

Question

A jet is launched from an aircraft carrier wit the aid of its own engine and a steam-powered catapult. The thrust of its engines is 2.3 x 10^5 N. In being launched from rest it moves through a distance of 87 m and has a KE of 4.5 x 10^7 J at lift off. Waht is the work dsone on the jet by the catapult?

Answer 1

1) KE from the engines alone = force * distance.

2) Total KE is given. Simply subtract the total KE from the number in step 1 to get the catapult eneregy.

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