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A 10 kg object is moving with a speed of 3 m/s. What is its kinetic energy?

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Question: A 10 kg object is moving with a speed of 3 m/s. What is its kinetic energy?

Options:

  1. 45 J
  2. 30 J
  3. 60 J
  4. 90 J

Correct Answer: 45 J

Solution: 

Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 10 kg × (3 m/s)² = 45 J.

A 10 kg object is moving with a speed of 3 m/s. What is its kinetic energy?

Practice Questions

Q1
A 10 kg object is moving with a speed of 3 m/s. What is its kinetic energy?
  1. 45 J
  2. 30 J
  3. 60 J
  4. 90 J

Questions & Step-by-Step Solutions

A 10 kg object is moving with a speed of 3 m/s. What is its kinetic energy?
Correct Answer: 45 J
  • Step 1: Identify the mass of the object. In this case, the mass is 10 kg.
  • Step 2: Identify the speed of the object. Here, the speed is 3 m/s.
  • Step 3: Write down the formula for kinetic energy: Kinetic Energy = 0.5 × mass × velocity².
  • Step 4: Substitute the mass and speed into the formula: Kinetic Energy = 0.5 × 10 kg × (3 m/s)².
  • Step 5: Calculate the square of the velocity: (3 m/s)² = 9 m²/s².
  • Step 6: Multiply the mass by the squared velocity: 10 kg × 9 m²/s² = 90 kg·m²/s².
  • Step 7: Multiply by 0.5: 0.5 × 90 kg·m²/s² = 45 J.
  • Step 8: Conclude that the kinetic energy of the object is 45 Joules.
  • Kinetic Energy – Kinetic energy is the energy an object possesses due to its motion, calculated using the formula KE = 0.5 × mass × velocity².
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