0 Members and 2 Guests are viewing this topic.

he's been killing it last 2 games

Arm = CannonesqueHair = flowing like the mighty MississippiBenny Baseball.http://www.masslive.com/redsox/index.ssf/2017/06/andrew_benintendis_91-mph_237-.html

You think an elite outfielder with a crow hop can't spin it over 90? Gtfo.

do the math, v = d/t correct? I would assume that's what the guy did, calculated where it was thrown from and how long it took to get to the plate

So watching the video, it appears at BEST the time is 2.5 seconds. The distance is approximately 280 feet in my estimation looking at the fence depths of Minute Maid Park. So the AVERAGE velocity of the ball across that distance would be: 280 ft. x 60 seconds/min x 60 min/hr divided by 2.5 seconds x 5280 ft/mile = (280 x 3600)/(2.5 x 5280) = 76.3 mph. Now, that's the AVERAGE speed over the 280 feet. The ball slows in it's trajectory. Using a distance of 280 ft and a launch angle of 15 degrees, the initial velocity actually calculates out to be 91 mph. So Vi = 91 mph, Vav = 76.3 mph, Vf = 61 mph. Just a little physics involved.

I went simpler than all that. I timed it 5 times and most favorably to Benitindi, it looks to be about 2.3 seconds. I took the 237 feet from the headline.237 feet in 2.3 seconds 103.04 ft/sec.Times 3600 (the number of seconds in an hour, that's 370,956.52 ft/hr.Divided by 5280, the number of feet in a mile, that's 70.26 MPH.Which also is pretty close to my initial eyeball test of 75 MPH.

Your 75 matches up well with my 76.3 mph. But that's AVERAGE velocity over the flight of the ball. The ball decelerates from the moment it leaves Benintendi's hand. Using the calculation I did with your 75 mph average velocity gives 90 mph beginning velocity and 60 mph final velocity. BINGO.

True enough, but I don't think you can use "initial velocity" as an important measure. When you say a pitcher throws the ball 90 MPH, that means for the whole 60'6", not the first five feet.So when the headline of the article says he threw 237 feet at 91 MPH, that's just wrong.

Not sure why you are going on this rant, but just stop. Your pitcher comparison: they always say so-and-so "hit 91 on the gun". These are baseball people or journalist wearing carpenter jorts with Crocs that couldn't find jobs in better paying fields. They're not trying to do linguistic gymnastics. They take the math that the nerds do and are usually pretty lost in the math and as a result, over summarize it. The throw hit 91 mph (and decelerated due to drag and air friction) and it was a former Hog. Be happy about it.

Has to be similar to a thrown object, I would think.

The velocity the ball travels in the first 60.5 feet is what a pitcher is measured at when calculating his pitch's velocity. Possibly the same thing to consider with Benny Baseball, because just a slight contradiction to the red headed physicist (who knows a whole lot more about this than I do), the ball actually will reach maximum velocity a few feet away from the the thrower's body (I can't remember the estimation), and then decelerate. I studied speed training for humans, not baseballs, and I do remember, vaguely, that a human will accelerate for only a short distance, and the "fastest" humans are those he decelerate the "slowest." Has to be similar to a thrown object, I would think.