Answer:
15.19 m/s
Explanation:
, where
is the final velocity,
is the initial velocity, a is the constant gravitational acceleration 9.8 m/s^2, and t is the time (seconds).
Since the ball is dropped off the bridge, its initial velocity is 0:

We can plug in 9.8 m/s^2 into a and 1.55 s into t:

= 15.19 m/s