Final answer:
To calculate the time for a ball to reach the hitter, the distance and speed are needed. The ball's speed when hit back can be found if time and distance are known.
Step-by-step explanation:
If a pitcher throws a baseball and it travels at 10 meters per second (m/s), we can calculate how long it takes to reach the hitter by using the formula time = distance/speed. However, we need to know the distance between the pitcher and the hitter to compute the time.
For the second part, if the hitter hits the ball back and it takes one second to reach the pitcher, we can determine the speed of the ball by rearranging the formula to speed = distance/time. Given the distance is the same as in the first part, we can calculate the ball's speed upon its return to the pitcher.