I remember being brought to the batting cages a couple times over the summer when I was younger. Not being interested in baseball at all, and still not being that interested, it was still a fun experience. In a batting cage, it's yourself, a bat, and this machine which shoots baseballs. The entire purpose is for you to try and hit the baseball, and there's net surrounding you so the baseball doesn't escape once you've hit it. So at a batting cage, there's a bunch of physics, such as how the baseball will travel towards you at a certain velocity, and then you'll swing the bat at a certain velocity with a certain force, and if you've aimed correctly, both the bat and baseball will come in contact and apply a force onto each other. After that, the ball travels in the opposite direction which it had been thrown at. If you had wanted to find its velocity for whatever reason, you could have someone time when the ball had been hit, and the time it stayed in the air and finally hit the ground, already knowing the acceleration, and measuring the distance, you'd use an equation such as vf=vi+at or vf^2=vi^2+2ad. One thing I learned from the experience is that you should also wear gloves because the force from the ball can hurt your hand after you've hit it, this being because of friction between the bat and your hands.