This is an explanation to how he did his calculations:
Vertical Velocity: I used the formula y= ax^2+bx+c. a in this equation represents half of the acceleration due to gravity. We chose -32.2 ft/sec as our acceleration due to gravity, so half of that is -16.1, that's how I got a. B is your vertical velocity, and since that is what we are trying to find, you have to keep it as a variable. C represents the initial hieght, so we measured where my are would be at the release point and got 5.5 feet. That is how I got the equation y= -16.1x^2+bx+5.5. Then, I substituted x and y for a point that we knew. We knew that when the ball hit the ground y would be 0. So we found the point where the ball hit the ground and that was at 1.67 seconds. So Y=0 and X=1.67 and I got the equation 0= -16.1(1.67^2)+b(1.67)+5.5. Lastly, I solved this equation and got b=23.59. SO my vertical velocity was 23.59 ft/sec.
Horizontal Velocity: I knew that to find horizontal velocity all you had to do was take the distance/time. My distance was 38 yards, but I needed it in feet. Since there are 3 feet in 1 yards, I multiplied 38 by 3 to get 114 feet. Also, my carry time in this experiment was 1.67. Knowing all of this, I got the equation 114/1.67, and after doing the math with that, I got 68.26 ft/sec.
Total Velocity: To find Total Velocity, you have to take your Vertical and Horizontal velocity, and use pythagorean theorem to find your total velocity. So I did 23.59^2+68.26^2=C^2. After going though and solving it, I got the answer 72.22ft/sec.
MPH: Once you find your total velocity, you have to convert it to MPH. To convert it you need to start by putting your total velocity over 1. So as it is in the table, 72.22ft/1 sec. Then, we are just going to make a bunch of giant 1s to cancel out the labels to get the one you want. So I put, 1 mile/5280ft, 60 sec/1 min, 60 min/ 1hr. As you can see, the seconds, feet, and minutes all cancel out. Leaving you with Miles on top, and Hours on the bottom. Then, you have to multiply all the numbers on top together, and multiply all of the numbers on the bottom together. Lastly, you take those 2 numbers (259,992mi/5280hr) and divide the top number by the bottom number, and get your MPH. After doing this, we got 49.24 MPH for Andre's Throw.