a fighter jet is launched from an aircraft carrier with the aid of its own engin

Question

a fighter jet is launched from an aircraft carrier with the aid of its own engines and a stream-powered catapult. the thrust of its engine is 2.3 x 10^5 N . in being launched from rest it moves through a distance of 87 m and has kinetic energy of 4.5 x 10^7 J at lift-off. what is the work done on the jet by the catapult?

Explanation / Answer

The total work done by the combined system = change in itskinetic energy ==> We + Wc = KE      ==> Wc = KE - We                   = KE - F.s                   = 4.5 x 107 - 2.3x105 * 87                   = 4.5 x 107 - 2.0x107                   = 2.5 x 107 J

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