Three identical balls are released from rest from the tops of three different friction-free ramps that all end at the same horizontal level. Ramp 1 drops vertically 2 m, Ramp 2 drops 3 m, and Ramp 3 drops 1 m. Which ranking correctly orders the balls’ speeds just before they reach the bottoms of their ramps?
a) v1=v2=v3
b) v3>v1>v2
c) v2>v1>v3
d) v1>v2>v3