- #1

herfox

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**(Projectile Motion)How to derive the equation??**

I made a device which use elastic band to launch a ping pong ball.

I have measured the distance traveled with different length of stretch at constant 36 degree launch angle. The graph plotted out is kind of curved, not straight line. And now I am asked to derive an equation to determine distance as a function of stretch...

Does anyone know how to do this? Cuz I spent almost a day still duno how to do it.