Lesson eLearning

A boy lifts a 2 kg sack of rice 2 meters up. Calculate the work done, assuming the acceleration due to gravity is 10 m/s².

hard 2 marks Class 3 · EVS · Work We Do
Answer
40 J

The correct answer is 40 J — Work = 20 N × 2 m = 40 J.

Step-by-step solution

  1. Work = weight × distance.
  2. Weight = mass × g = 2 kg × 10 m/s² = 20 N.
  3. Distance = 2 m.
  4. Work = 20 N × 2 m = 40 J.
Common mistake: Using mass instead of weight or forgetting to multiply by distance

Concept tested: Calculating work using weight and distance

Published · How this solution was prepared and checked

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