A 0.5 kg object moves at 4 m/s. What is its kinetic energy?

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Multiple Choice

A 0.5 kg object moves at 4 m/s. What is its kinetic energy?

Explanation:
Kinetic energy is the energy of motion, described by KE = 1/2 m v^2. With a mass of 0.5 kg and a speed of 4 m/s, square the speed to get 16. Multiply by the mass: 0.5 × 16 = 8, then take half of that (the 1/2 factor): 8 × 1/2 = 4. So the kinetic energy is 4 joules. This also illustrates how KE depends on speed squared: increasing speed has a bigger effect because of the v^2 term.

Kinetic energy is the energy of motion, described by KE = 1/2 m v^2. With a mass of 0.5 kg and a speed of 4 m/s, square the speed to get 16. Multiply by the mass: 0.5 × 16 = 8, then take half of that (the 1/2 factor): 8 × 1/2 = 4. So the kinetic energy is 4 joules. This also illustrates how KE depends on speed squared: increasing speed has a bigger effect because of the v^2 term.

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