If a 1000 kg car is moving at a speed of 36 km/h, what is its kinetic energy? (2

Practice Questions

Q1
If a 1000 kg car is moving at a speed of 36 km/h, what is its kinetic energy? (2021)
  1. 500 J
  2. 1000 J
  3. 2000 J
  4. 3000 J

Questions & Step-by-Step Solutions

If a 1000 kg car is moving at a speed of 36 km/h, what is its kinetic energy? (2021)
  • Step 1: Identify the mass of the car, which is 1000 kg.
  • Step 2: Identify the speed of the car, which is 36 km/h.
  • Step 3: Convert the speed from km/h to m/s. To do this, divide 36 by 3.6. This gives you 10 m/s.
  • Step 4: Use the formula for kinetic energy (KE), which is KE = 1/2 * m * v^2.
  • Step 5: Plug in the values: KE = 1/2 * 1000 kg * (10 m/s)^2.
  • Step 6: Calculate (10 m/s)^2, which is 100 m^2/s^2.
  • Step 7: Multiply 1000 kg by 100 m^2/s^2 to get 100000 kg*m^2/s^2.
  • Step 8: Now multiply by 1/2, which gives you 50000 J (Joules).
  • Kinetic Energy – Kinetic energy is the energy an object possesses due to its motion, calculated using the formula KE = 1/2 * m * v^2.
  • Unit Conversion – Converting speed from kilometers per hour to meters per second is essential for using the kinetic energy formula correctly.
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