Given no force to negate the velocity, an acceleration of 9.8m/s2 means that an object dropped will gain a velocity of 9.8m/s every second - at 0 time with 0 velocity, 1 second later the object is at 9.8 m/s, at 2 seconds the object is moving at 19.6 m/s, 3 seconds. As I'm a science student it's actually funny.