You (A) are in a sledge sliding down an inclined plane. (Friction is neglected). An observer (B) at the foot of the plane looks at your initial position at the top of the slide and sees your energy as potential energy (mgh). You (A) slide down to the bottom of the plane and have a velocity of V0 . So the observer sees mgh = mV02/2 which is the law of conservation of energy.
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This solution is provided in 645 words and attached in both .doc and .pdf format. Conservation of energy law in moving frames is given in the form of two equations to solve the problem.