3. Calculate the amount of gravitational potential energy at the top of each hill and at the bottom of each valley. Be sure to convert your distance measurements to meters.Use an approximated value of 58.0 g for the mass of the tennis ball, and 9.81 m/s2 as the acceleration due to gravity.

Answer 1

I think it would help to know the elevations in the hills and valleys, no?

and PE relative to what?

Anyway, PE = mgh

so knock yourself out ...