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Question

A stone weighing 1kgis dropped from rest from a height of 4m above the ground. When it has free-fallen 1m, what will be its total energy with respect to the ground?


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Solution

  1. Energy is conserved in free-fall.
  2. Thus total energy will be the same at all stages of falling.
  3. Total energy is the sum of potential energy and kinetic energy.
  4. At the initial point, the stone has only potential energy, as it is at rest.

Calculation of potential energy at the initial point:

Potential energy, PE =mgh=1×10×4J=40J

So, Total energy after free-fall of 1mwill be 40J.


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