Physics
posted by James .
Calculate the speed of an 7.8×104 kg airliner with a kinetic energy of 1.0 × 109 J.
Answer in units of m/s.

Physics 
drwls
Use the definition of Kinetic Energy, (M/2)V^2, and solve for V.
A little algebraic manipulation should convince you that
V = sqrt[2*(K.E.)/M]
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