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cy19861126

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The "force platform" is a tool that is used to analyze the performance of athletes by measuring the vertical force as a function of time that the athlete exerts on the ground in performing various activities. A simplified force vs time graph for an athlete performing a standing high jump is shown below (see attachment). The athlete started the jump at t = 0.0s. How high did this athlete jump?

My work so far:

okie, using the equation, I = p:

Ft = mvf - mvi

At the highest point, vf = 0, so...

1000N * 1.0s = -mvi

Now what do I do? I got an equation with two unknowns. I know that once you solve for vi, you can just use the equation: x = vit + 0.5at^2 to solve for x. The question is how do I get vi?

If you can't see the attachment, go to: http://students.washington.edu/cy1126/Physics.jpg [Broken]

My work so far:

okie, using the equation, I = p:

Ft = mvf - mvi

At the highest point, vf = 0, so...

1000N * 1.0s = -mvi

Now what do I do? I got an equation with two unknowns. I know that once you solve for vi, you can just use the equation: x = vit + 0.5at^2 to solve for x. The question is how do I get vi?

If you can't see the attachment, go to: http://students.washington.edu/cy1126/Physics.jpg [Broken]

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