A Hockey Puck Slides Off the Edge of a Platform

Multiple Choice

A hockey puck slides off the edge of a platform with an initial velocity of 20 m/s horizontally.The height of the platform above the ground is 2.0 m.What is the magnitude of the velocity of the puck just before it touches the ground? You can neglect air resistance.

A) 21 m/s
B) 22 m/s
C) 24 m/s
D) 25 m/s
E) 6.3 m/s