Practice question · True or false
A ball dropped from a given height arrives at the ground with a speed that does not depend on its mass.
Hints
- Set the potential energy equal to the kinetic energy.
- The mass appears on both sides.
Show the answer
True
Why
True. gives , the mass cancels. That is Galileo's result, and it holds only while air resistance is negligible: a feather and a hammer fall together on the Moon and visibly do not on Earth, because drag depends on shape and area rather than mass.
Practise Work, Energy, and Power
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