Best Answer:
I'm not sure this CAN be answered. Are you leaving part of the problem out?

Calculating the slope is pretty simple. The formula is y-y/x-x. That is, (34-4)/(9.8-5). The slope is thus 30/4.8 or just 6.25.

Now, I know how to calculate percent error. The equation is:

((your result - accepted value)/accepted value) * 100

Noting that it is the absolute value of the difference between your result and the accepted value.

However, what is the accepted value for this slope? That's what you need. After that, you can just plug the values in. In other words:

((6.25 - x)/x) * 100 = slope percent error

Equation for percent difference:

(x-x)/((x+x)/2) * 100

So, it's (9.8-5) divided by (9.8+5)/2 then all of that multiplied by 100.

(4.8/7.4) * 100 = 64.86 percent = 65%

Source(s):
http://www.docstoc.com/docs/5949015/calculate-percent-error-in-physics

Anonymous
· 9 years ago