I forget how to solve this. Please help me and explain, so I could do it on my own. Thank you for your time.

A ball is thrown horizontally from the top of a building 14.I'm high. The ball strikes the ground at a point 68.8 m from the base of the building. The acceleration of gravity is 9.8 m/s- Find the time the ball is in motion, Answer in units of s. Answer in units of s part 2 of 4 Your response. Find the initial velocity of the ball. i Answer in units of m/s