A 4 kg object is lifted to a height of 3 m. What is the increase in gravitationa

Practice Questions

Q1
A 4 kg object is lifted to a height of 3 m. What is the increase in gravitational potential energy?
  1. 12 J
  2. 24 J
  3. 36 J
  4. 48 J

Questions & Step-by-Step Solutions

A 4 kg object is lifted to a height of 3 m. What is the increase in gravitational potential energy?
  • Step 1: Identify the mass of the object. In this case, the mass (m) is 4 kg.
  • Step 2: Identify the height to which the object is lifted. Here, the height (h) is 3 m.
  • Step 3: Identify the acceleration due to gravity. This is approximately 9.8 m/s² on Earth.
  • Step 4: Use the formula for gravitational potential energy, which is: Increase in potential energy = mgh.
  • Step 5: Plug in the values into the formula: Increase in potential energy = 4 kg × 9.8 m/s² × 3 m.
  • Step 6: Calculate the result: 4 × 9.8 × 3 = 117.6 J.
  • Step 7: Conclude that the increase in gravitational potential energy is 117.6 Joules.
  • Gravitational Potential Energy – The energy an object possesses 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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