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"It is difficult to run fast on sand ". ...

"It is difficult to run fast on sand ". Why?

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To understand why it is difficult to run fast on sand, we can analyze the forces acting on a person running on different surfaces, specifically comparing sand to a hard surface. ### Step-by-Step Solution: 1. **Identify the Forces Acting on the Runner**: - When a person runs, their weight (mg) acts downward due to gravity. - There is also a normal reaction force (R) acting upward from the surface. ...
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