**1. The problem statement, all variables and given/known data**

In this experiment we tied a cart to a hanging mass and measured the velocity as it passed through a gate, and recorded the mass of the cart. I calculated the potential and kinetic energy of the hanging mass and when I subtracted the potential from the kinetic, I got a negative number. Does this mean that energy was lost? Do these results make sense? Please let me know if I wasn’t descriptive enough of the scenario!

**2. Relevant equations**

K=(1/2)mv^{2}

U=mgh

K-U

**3. The attempt at a solution**

Here is what I did for trial 1 (all of the units are what they need to be for the formula to work):

Calculating Kinetic Energy:

K=(1/2)(0.075)(1.23)^{2}=0.0567 J

Calculating Potential Energy:

U=(0.075)(9.8)(0.86) =0.6321

The difference:

0.0567-0.6321= -0.575

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