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From there, you can gather several trials of data and average your travel distances and the corresponding heights as well as measure the angle of elevation. After that, it's simply a matter of conservation of energy and the work done by the frictional force to solve for the initial velocity.

What I want to know is, what are the consequences of lathering the ball in oil? How much in general would the oil reduce friction? Is that calculable? Can we find the coefficient of kinetic friction? If so, how?

This is just a simple first semester physics problem, so things such as center of mass and air resistance are negligible.

Am I overlooking anything important?