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working out so they could build more muscles

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The wind could cause the runner to slow down and that would affect their speed.
If there is no wind then that would help them because they wouldn't be slowed down by the wind.

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If 2 sprinters weighed the same the one that is using more force would go faster. There are no weight classes to my sport.

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The starting blocks have spikes under them so the starting block don't fly off when the runner uses their force off of it.

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runners use sprinters use force to push themselves off the blocks. They each weigh something different so their acceleration.

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when the runner is running a straight line they are at their top speed. which when they turn the corner they lose some Velocity.