If a 1000 kg car is moving with a speed of 15 m/s, what is its kinetic energy?

Practice Questions

Q1
If a 1000 kg car is moving with a speed of 15 m/s, what is its kinetic energy?
  1. 112,500 J
  2. 225,000 J
  3. 75,000 J
  4. 150,000 J

Questions & Step-by-Step Solutions

If a 1000 kg car is moving with a speed of 15 m/s, what is its kinetic energy?
  • Step 1: Identify the mass of the car. The mass is given as 1000 kg.
  • Step 2: Identify the speed of the car. The speed is given as 15 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 × 1000 kg × velocity².
  • Step 5: Calculate the square of the velocity: (15 m/s)² = 225 m²/s².
  • Step 6: Substitute the squared velocity back into the formula: Kinetic Energy = 0.5 × 1000 kg × 225 m²/s².
  • Step 7: Multiply 0.5 by 1000 kg to get 500 kg.
  • Step 8: Multiply 500 kg by 225 m²/s² to get 112500 kg·m²/s², which is equal to 112500 J.
  • Step 9: Conclude that the kinetic energy of the car is 112,500 J.
  • Kinetic Energy – Kinetic energy is the energy that an object possesses due to its motion, calculated using the formula KE = 0.5 × mass × velocity².
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