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its 800

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Q: What is the amount of displacement of a runner who runs exactly 2 laps around of a 400 meter track?

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its 800

its 800

It is zero metres.

its 800

zero as he reaches the same point he starts

its 800

The New Balance 991 has a unique cushioning within the soles that provides energy displacement for the foot as the runner runs. This energy displacement reduces the heel strike as the runner makes contact with the ground. So when the runner runs they're more comfortable.

. . . what does it mean exactly to be human .

A non-runner is a term used in betting such as in horse races. The definition of a non-runner is a selection that has been withdrawn from an event before it has started.

The speed of an object does not, by definition, have a direction. Speed is defined as the total distance that an object travels divided by the time that it takes the object to travel that distance. A similar concept which does have a direction is velocity. Velocity is defined as the displacement of the object (how far it has moved from its original position and the direction in which it has moved) divided by the time during which it moved. The difference between these two concepts can also be explained in terms of a runner completing a lap around a quarter-mile track. If it takes the runner three minutes to complete the lap, the runner's speed is .25miles/3minutes. The runner's velocity, however, is zero. This is because the runner starts at the same place that they end (because the track is a loop) so that at the end of the 3minutes they are back where they started which makes their displacement zero.

Not sure exactly what you're asking, but yes, you can knock a runner over by tripping into them. All it really takes is a hard shove, because a runner's feet rarely touch the ground at the same time.

I own a 2001 Suzuki quad runner 250 and it takes SAE 10w-40. The amount I do not know.