new physics student having trouble with hw, not sure how to set this up or find the answer. thow a ball straight up with an initial vel. of 18.

new physics student having trouble with hw, not sure how to set this up or find the answer. thow a ball straight up with an initial vel. of 18.5m/s. if ball is caught at the same height it was released, then calculate the max. height achieved by the ball and its total time in the air.