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If a person lifts a 20 kg box to a height of 2 m, what is the work done against

Practice Questions

Q1
If a person lifts a 20 kg box to a height of 2 m, what is the work done against gravity? (g = 9.8 m/s²)
  1. 392 J
  2. 196 J
  3. 588 J
  4. 784 J

Questions & Step-by-Step Solutions

If a person lifts a 20 kg box to a height of 2 m, what is the work done against gravity? (g = 9.8 m/s²)
  • Step 1: Identify the mass of the box. In this case, the mass (m) is 20 kg.
  • Step 2: Identify the height the box is lifted to. Here, the height (h) is 2 m.
  • Step 3: Identify the acceleration due to gravity. It is given as g = 9.8 m/s².
  • Step 4: Use the formula for work done against gravity: Work = m * g * h.
  • Step 5: Substitute the values into the formula: Work = 20 kg * 9.8 m/s² * 2 m.
  • Step 6: Calculate the result: 20 * 9.8 * 2 = 392 J.
  • Step 7: Conclude that the work done against gravity is 392 Joules.
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