O.k we did the stop watch thing golf ball 75yds
i made ten tosses at the side of a brick wall with every thing I had I am glad it was a large building  because i almost missed a couple of times. I have not done the math but the average came out 1.34 seconds this was with a digital stop watch sorry about it being yards instead of meters but that was the tape I had.and measure may be of a bit. because it was only a 75 yd tape also a couple of times i beleave I threw before mark by maybe a foot
so take this for what you will and probaly a grain of salt lol

Hello,

After reading this thread on measuring velocity, I have to suggest an easier/better way. A shooting chronograph has two light gates and measures an objects velocity with extreme accuracy. Here is a link, http://www.eabco.com/chronyshooting.htm.

All you have to do is cut a 10 inch diameter hole in a piece of plywood, then mount the chronograph on the backside so it will be protected from the throw. Then hope your accurate enough to throw through the hole.
The closer you are to the chronograph the more it will reflect the true max velocity, and the easier it will be to hit your target.

-erin

Time for me to chime in.

We could reverse engineer the speed of any projectile if we have given factors such as mass of the projectile, the angle at which it was thrown (trajectory) and the distance it flew until it hit the ground.
R = MxV@T: Range equals Mass times Velocity at trajectory.

For instance, a ten pound round projectile needs to fly at just over 120 MPH to reach 1,000 feet.
(Am I the only one here who hurls pumpkins?)



If you really want to find out the velocity of your projectile, I suggest asking for help from a local math or science teacher. 

If I read what was stated correctly, then 117 MPH for a lead sinker or a golf ball is not unreasonable but fairly good.

Physics rule: a short sling swings faster than a long one.

My rules:
Accuracy beats speed.
Range requires speed and mass.
Hitting your target at any range, priceless.

Can pounds be substituted for grams and feet for meters? And say that we used your example:

1000 ft.=10 lbs.*120 mph @ T

What's the "@ T" used for? Can you do a sample problem, this is interesting and I want to learn how to do this.

The plywood won't protect the chronograph.  I've seen a rock go through two pieces of 5/8 inch plywood.

Quote:

ish? 200 fps, but keep in mind that the projectile is much heavier...

What's that in mph or kmph?

I think I can do up to 150 mph and bigger stronger guys can do much better than me.