A ball player catches a ball 3s later after throwing it vertically upward, with what
speed did he throw it?

Becomes zero as it reached the maximum height, and increases as it falls.What is velocity?In physics, velocity is defined as a vector measurement of the motion's direction and rate. To be more explicit, an object's velocity can be defined as the rate of change in the object's position with respect to a frame of reference and time. Simply said, velocity describes the rate at which an object moves in a specific direction. It determines how quickly or slowly something moves. Consider the following scenario: two moving objects. If both items are going in the same direction, it is simple to determine which one is moving faster. However, distinguishing which of the two objects is faster is challenging.T t = 3.0Time Traveled Upward: t = 1.5s \sFind:Initial Speed: v I =?y m an x =? Starting SpeedWe will utilise the kinematics equation to solve this.We'll divide the total time by two and utilise the time (t) it took the ball to reach the maximum height.At maximum height, the ball has no velocity.vf=−gtvfvi−gt0vi−(9.8m/s2)(1.5s)0=vi−15 m/svi=15 m/sLearn more about velocity from given link https://brainly.com/question/24739297#SPJ4