A golf ball rolls off a horizontal cliff with an initial speed of 11.4 m/s. The ball

Question:

A golf ball rolls off a horizontal cliff with an initial speed of 11.4 m/s. The ball falls a vertical distance of 15.5 m into a lake below.
(a) How much time does the ball spend in the air?
(b) What is the speed v of the ball just before it strikes the water?