v = x/t
v = average velocity, x = displacement, t = elapsed time
Given values:
x = 6km south, t = 60min
Plug in and solve for v:
v = 6/60
v = 0.1km/min south
the puck recoils in each case.
larger mass stone gives puck greater recoil, smaller stone, smaller recoil
I think the correct answer is D: Potential Energy.
