What is the kinetic energy of a 3 kg mass moving at 4 m/s?

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Multiple Choice

What is the kinetic energy of a 3 kg mass moving at 4 m/s?

Explanation:
Kinetic energy is ½ m v^2. With a mass of 3 kg and speed of 4 m/s, v^2 is 16, so KE = 0.5 × 3 × 16 = 24 joules. The other numbers would come from different speeds (for the same mass, different velocities give different KE values), for example a speed of about 2.83 m/s would give 12 J, and higher speeds would give 36 J or 48 J.

Kinetic energy is ½ m v^2. With a mass of 3 kg and speed of 4 m/s, v^2 is 16, so KE = 0.5 × 3 × 16 = 24 joules. The other numbers would come from different speeds (for the same mass, different velocities give different KE values), for example a speed of about 2.83 m/s would give 12 J, and higher speeds would give 36 J or 48 J.

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