If a 4 kg object is moving with a speed of 5 m/s, what is its kinetic energy?

Practice Questions

Q1
If a 4 kg object is moving with a speed of 5 m/s, what is its kinetic energy?
  1. 50 J
  2. 40 J
  3. 100 J
  4. 80 J

Questions & Step-by-Step Solutions

If a 4 kg object is moving with a speed of 5 m/s, what is its kinetic energy?
  • Step 1: Identify the mass (m) of the object. In this case, m = 4 kg.
  • Step 2: Identify the speed (v) of the object. Here, v = 5 m/s.
  • Step 3: Use the formula for kinetic energy: KE = 0.5 × m × v².
  • Step 4: Calculate v² (the speed squared). v² = (5 m/s) × (5 m/s) = 25 m²/s².
  • Step 5: Substitute the values into the formula: KE = 0.5 × 4 kg × 25 m²/s².
  • Step 6: Calculate 0.5 × 4 = 2.
  • Step 7: Multiply 2 by 25 to get KE: 2 × 25 = 50 J.
  • 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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