posted by Ricardo .
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 3.82 x 105 N. In being launched from rest it moves through a distance of 57.2 m and has a kinetic energy of 5.71 x 107 J at lift-off. What is the work done on the jet by the catapult?
F*X = 3.82*10^5*57.2 = 2.19*10^7 J
is the work done by the engines.
Subtract that from the final KE for the work done by the catapult.