A toy plane has a mass of 2 point 5 kilograms and is 18 m above the ground. It is moving at 4.5 meters per second How much mechanical energy does the toy plane have?

Mechanical energy is the sum of gravitational potential energy and kinetic energy. Using g = 9.8 m/s², the potential energy is 2.5 × 9.8 × 18 = 441 J, and the kinetic energy is ½ × 2.5 × 4.5² ≈ 25 J. The total is about 466 J, so the answer is 466 J.

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