What is the kinetic energy of a 1.0 kg object moving at 3 m/s?

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Prepare for the Year 10 Force and Motion Test. Utilize flashcards and multiple-choice questions with clear hints and explanations to ensure success. Equip yourself for excellence on your exam!

Multiple Choice

What is the kinetic energy of a 1.0 kg object moving at 3 m/s?

Explanation:
Kinetic energy depends on both how heavy something is and how fast it’s moving, and is found with KE = 1/2 m v^2. With a mass of 1.0 kg and a speed of 3 m/s, you square the speed to get 9, then multiply by the mass and by 1/2: KE = 0.5 × 1.0 × 9 = 4.5 joules. So the motion stores 4.5 J of energy. The other numbers come from common slips, like omitting the 1/2 factor or not squaring the speed, which would give different values such as 9 J, 1.5 J, or 3 J.

Kinetic energy depends on both how heavy something is and how fast it’s moving, and is found with KE = 1/2 m v^2. With a mass of 1.0 kg and a speed of 3 m/s, you square the speed to get 9, then multiply by the mass and by 1/2: KE = 0.5 × 1.0 × 9 = 4.5 joules. So the motion stores 4.5 J of energy. The other numbers come from common slips, like omitting the 1/2 factor or not squaring the speed, which would give different values such as 9 J, 1.5 J, or 3 J.

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