Multiple choice general knowledge science & technology

A mass of 90 kg is moved vertically upwards through a distance of 10 m. If the gravitational acceleration is 9.8 m s-2, then the work done against gravity is

  1. 8820 J

  2. 882 J

  3. 441 J

  4. 1000 J
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A Correct answer
Explanation

Work against gravity is W = mgh = 90 kg × 9.8 m/s² × 10 m = 8820 J. This is the gravitational potential energy gained. When lifting against gravity, work equals force (weight) times vertical distance.

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