- #1

steve092

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**Trebuchet help: Calculating velocity**

## Homework Statement

I'm new to this site, so bear with me!

OK, so I'm doing a trebuchet for my physics project. I have done three trials with counterweights of different masses. I have all of the distances that a golf ball of mass=0.045kg has traveled. I also have the masses of the counterweights.

Just as a starting point for the first trial:

mass of the counterweight=10.937

h=0.631m

The average distance for this trial was 34.33m.

## Homework Equations

PE

_{g}=mgh

KE=(1/2)mv

^{2}

## The Attempt at a Solution

I've done the calculations; however, my answers were nowhere near what the velocity should be. For one trial, the mass of the counterweight was 10.937kg. I did the calculations and the velocity came out to be 3.53m/s which seemed a little slow.

Obviously, I'm doing something wrong. I wonder if it is because the mass of the golf ball needs to be taken into account somehow? Anyways, thanks in advance!

I've used the example from https://www.physicsforums.com/showthread.php?t=250335&highlight=trebuchet and I still can't get it. I don't even understand how the answer was calculated in that example.

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