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speed question

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pc6817
 
Reply Wed 14 Sep, 2005 11:47 pm
A sprinter can accelerate with constant acceleration for 4.0 s
before reaching top speed. He can run the 100-meter dash in
10 s. What is his speed as he crosses the finish line?

??????
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fresco
 
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Reply Thu 15 Sep, 2005 01:35 pm
Distance is the area under the velocity time graph (which is a trapezium)

D=1/2 *V*T1 (the triangle) + V*T2 (the rectangle)

so 100 = 2V +6V hence V=12.5 m/s
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