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**calculating percent error in a lab please help!!**

## Homework Statement

I have to calculate an experimental value for g using values from my lab. I got -45.9 as my value, and now i have to calculate the percent error

## Homework Equations

a= g (m2 - m1/ m2+m1) was the equation i used

actual-calculate/calculated x 100

## The Attempt at a Solution

Would I use negatives or not?

9.81- - 45.9 / - 45.9 x 100 = -121.4 %

or

9.81-45.9 / - 45.9 x 100 = 78.6 %

part b says derive the equation for a in the form a = F/m (f and m in terms of forces and messes in the atwood machine) but I have no idea what he is asking me to do

thank you!