The kinetic energy of a 2 kg mass moving at 3 m/s is:

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Multiple Choice

The kinetic energy of a 2 kg mass moving at 3 m/s is:

Explanation:
Kinetic energy depends on speed and is found using KE = 1/2 m v^2. With a mass of 2 kg moving at 3 m/s, the energy is KE = 1/2 × 2 × (3)^2 = 1 × 9 = 9 joules. The joule is kg·m^2/s^2, so the units check out. This shows how the speed squared drives the energy: at this speed and mass you have 9 J of kinetic energy. The other numbers would require a different mass or speed, so they don’t fit this scenario.

Kinetic energy depends on speed and is found using KE = 1/2 m v^2. With a mass of 2 kg moving at 3 m/s, the energy is KE = 1/2 × 2 × (3)^2 = 1 × 9 = 9 joules. The joule is kg·m^2/s^2, so the units check out. This shows how the speed squared drives the energy: at this speed and mass you have 9 J of kinetic energy. The other numbers would require a different mass or speed, so they don’t fit this scenario.

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