Galileo discovered that gravity affects acceleration of objects regardless of their mass. The cannon balls were different weights and were dropped from different heights yet both balls landed at the same time.
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While all waves can transmit energy through a medium, certain waves can also transmit energy through empty space. A medium is a material through which waves can travel. It can be a solid, liquid, or gas. When waves travel through a medium, the particles of the medium are not carried along with the wave.
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Answer:
Measurement is important so we could measure certain things right. By taking measurements we can have a knowledge of sizes, lengths, widths etc.
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