A 10 kg object is dropped from a height of 20 m. What is the potential energy at

Practice Questions

Q1
A 10 kg object is dropped from a height of 20 m. What is the potential energy at the top? (2022)
  1. 200 J
  2. 1000 J
  3. 500 J
  4. 400 J

Questions & Step-by-Step Solutions

A 10 kg object is dropped from a height of 20 m. What is the potential energy at the top? (2022)
  • Step 1: Identify the mass of the object. In this case, the mass is 10 kg.
  • Step 2: Identify the height from which the object is dropped. Here, the height is 20 m.
  • Step 3: Identify the acceleration due to gravity (g). The standard value is approximately 9.8 m/s².
  • Step 4: Use the formula for potential energy: Potential Energy = mass × g × height.
  • Step 5: Substitute the values into the formula: Potential Energy = 10 kg × 9.8 m/s² × 20 m.
  • Step 6: Calculate the potential energy: 10 × 9.8 × 20 = 1960 J.
  • Potential Energy – Potential energy is the energy stored in an object due to its position in a gravitational field, calculated using the formula PE = mass × gravity × height.
  • Gravitational Acceleration – The acceleration due to gravity (g) is approximately 9.8 m/s² near the Earth's surface, which is a key value in calculating potential energy.
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