A 3 kg object is dropped from a height of 12 m. What is the potential energy at

Practice Questions

Q1
A 3 kg object is dropped from a height of 12 m. What is the potential energy at the top?
  1. 30 J
  2. 36 J
  3. 60 J
  4. 120 J

Questions & Step-by-Step Solutions

A 3 kg object is dropped from a height of 12 m. What is the potential energy at the top?
  • Step 1: Identify the mass of the object. In this case, the mass (m) is 3 kg.
  • Step 2: Identify the height from which the object is dropped. The height (h) is 12 m.
  • Step 3: Identify the acceleration due to gravity. The value of g is approximately 9.8 m/s².
  • Step 4: Use the formula for potential energy, which is PE = mgh.
  • Step 5: Substitute the values into the formula: PE = 3 kg × 9.8 m/s² × 12 m.
  • Step 6: Calculate the result: 3 × 9.8 × 12 = 352.8 J.
  • Step 7: Conclude that the potential energy at the top is 352.8 Joules.
  • Potential Energy – Potential energy is the energy possessed by an object due to its position in a gravitational field, calculated using the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.
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