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**Bouncing Ball KE and momentum??**

Does anyone know how to calculate the KE and momentum of a bouncing ball?

My quadratic equation is -4.113^t2+19.7t-22.72

The bounce begins at t=1.90s

the bounce ends at t=2.85s

The maximum height from my graph is (i think).8m.

For this exp I don't need the mass as I am trying to derive the following KE/m and p/m both before and after impact.

I am so confused;

do I plug in the start time of the bounce into the quadratic equation? then what? i nkow PE is related to this somehow, so should I be using gh to find KE/m?

can someone please help?