Where is the potential energy of a magnet stored? a)Inside the north pole
b) Inside the south pole
c) In the magnetic field
d)In the electric field

i think c?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)