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N.geNuity
United States5111 Posts
his "t" is not constant if he changes his speed. But his average works out to 15. Average speed = |d| /time. He runs 2 ticks in the time it takes the train to go 8. His average speed is 1/4 the train. Thus it is 15. If you run a 100m race, and run 99.9 metres in one second (99.9 m/s), then stopped and did the last 0.1m to finish at exactly 10 seconds, your average is 10 m/s. When he averages 15, you can think of it this way: 5/8 * 12 + 3/8 * 20 = 15 km/h. | ||
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JeeJee
Canada5652 Posts
i believe the problem here is that n.genuity thinks that the train is drawn relative to the 2d graph, when it's not. it's not 5 bars away from point b, you don't know how far away it is (although you can work out it must be 3 bars given the constant speed constraints) if you think it is drawn to scale, wouldn't the train be about 4.25 bars away given that the front of the train will hit the person rather than the wheel? | ||
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Thats_The_Spirit
Netherlands138 Posts
Sorry for the confusion. | ||
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