An object is moving with a speed of 15 m/s and has a mass of 3 kg. What is its k

Practice Questions

Q1
An object is moving with a speed of 15 m/s and has a mass of 3 kg. What is its kinetic energy?
  1. 67.5 J
  2. 45 J
  3. 90 J
  4. 135 J

Questions & Step-by-Step Solutions

An object is moving with a speed of 15 m/s and has a mass of 3 kg. What is its kinetic energy?
  • Step 1: Identify the formula for kinetic energy, which is KE = 0.5 × m × v².
  • Step 2: Identify the mass (m) of the object, which is 3 kg.
  • Step 3: Identify the speed (v) of the object, which is 15 m/s.
  • Step 4: Calculate v² (the speed squared): (15 m/s)² = 15 × 15 = 225 m²/s².
  • Step 5: Substitute the values into the kinetic energy formula: KE = 0.5 × 3 kg × 225 m²/s².
  • Step 6: Calculate 0.5 × 3 = 1.5.
  • Step 7: Multiply 1.5 by 225: 1.5 × 225 = 337.5 J.
  • Step 8: The kinetic energy of the object is 337.5 Joules.
  • Kinetic Energy – Kinetic energy is the energy an object possesses due to its motion, calculated using the formula KE = 0.5 × m × v², where m is mass and v is velocity.
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