A horizontal line means the object is moving at a constant speed. The gradient of the line = the rate of change of speed. The steeper the line, the greater the increase in speed. The area under the ...
The fastest Olympic sprint was Usain Bolt’s 100 meters at the London Games, averaging more than 23 miles per hour for 9.63 seconds. Marathoners, who run for two hours, top out around half of Bolt’s ...
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