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Pi Face

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I thought about this and came up with the conclusion that although the entrance speeds may be the same, the horizontal and vertical speeds are different. In order to maximize the horizontal entrance speed, would you have to push off the block at basically a horizontal path? But then, if you angle your dive upwards you are able to let gravity add to your momentum and therefore add to your speed.

Will this project work out? Or will I find out that no matter what angle you dive at it doesn't matter (or is simply a straight line)?

Can anyone help me get stared on the right track? For my experiment, I'll be using myself as the model. Because I don't have access to a pool this moment, and don't know of a better way to measure the force of which i push off the block, I think I should somehow calculate the force with which I jump and use that value instead. How would I go about doing that?