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found (b) to be 60 degrees

the loss is only the rt3

What is that vi=rt(3)vf supposed to mean anyway?

vi is the initial velocity and vf is the final velocity

and rt(3) is just an arbitrary fraction of 1?

yeah, what is rt(3)?

the loss in the vertical velocity after it bounces

velocity vector <15sqrt(2), 15sqrt2 - 10t>
position vector < t15sqrt(2), t15sqrt(2) - 5t^2>

what is the 15sqrt2 - 10t in the velocity vector supposed to mean?

are you approximating g to 10?