A 3 kg object is moving with a velocity of 4 m/s. What is its kinetic energy?

Practice Questions

Q1
A 3 kg object is moving with a velocity of 4 m/s. What is its kinetic energy?
  1. 12 J
  2. 24 J
  3. 36 J
  4. 48 J

Questions & Step-by-Step Solutions

A 3 kg object is moving with a velocity of 4 m/s. What is its kinetic energy?
  • Step 1: Identify the mass of the object. The mass is 3 kg.
  • Step 2: Identify the velocity of the object. The velocity is 4 m/s.
  • Step 3: Write down the formula for kinetic energy: Kinetic Energy = 0.5 × mass × velocity².
  • Step 4: Substitute the mass into the formula: Kinetic Energy = 0.5 × 3 kg × velocity².
  • Step 5: Calculate the square of the velocity: (4 m/s)² = 16 m²/s².
  • Step 6: Substitute the squared velocity into the formula: Kinetic Energy = 0.5 × 3 kg × 16 m²/s².
  • Step 7: Multiply 0.5 by 3 kg to get 1.5 kg.
  • Step 8: Multiply 1.5 kg by 16 m²/s² to get 24 J.
  • Step 9: Conclude that the kinetic energy of the object is 24 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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