What is the kinetic energy of a 3 kg object moving at 6 m/s?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

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 3 kg object moving at 6 m/s?

Explanation:
Kinetic energy depends on how much energy an object has because of its motion, and it’s calculated with KE = 1/2 m v^2. For a mass of 3 kg moving at 6 m/s, first square the speed: v^2 = 6^2 = 36. Then multiply by the mass and by 1/2: KE = 1/2 × 3 × 36 = 1.5 × 36 = 54 joules. That 54 J value reflects both the mass and the speed, with the 1/2 factor and the velocity squared both crucial. Using the velocity without squaring or dropping the 1/2 would give different results (e.g., 108 J from m v^2, or 27 J from incorrectly applying the factor), but the correct calculation yields 54 joules.

Kinetic energy depends on how much energy an object has because of its motion, and it’s calculated with KE = 1/2 m v^2.

For a mass of 3 kg moving at 6 m/s, first square the speed: v^2 = 6^2 = 36. Then multiply by the mass and by 1/2: KE = 1/2 × 3 × 36 = 1.5 × 36 = 54 joules.

That 54 J value reflects both the mass and the speed, with the 1/2 factor and the velocity squared both crucial. Using the velocity without squaring or dropping the 1/2 would give different results (e.g., 108 J from m v^2, or 27 J from incorrectly applying the factor), but the correct calculation yields 54 joules.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy