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## Homework Statement

So I am doing this roller coaster lab in my physics class and I'm having some problems.

You have to find the initial height of a hill and initial velocity; which was easy and I found this out.

PEi = PEf+KEf

m*9.8*h i = m*9.8*0.4572 + 1/2*m*(1.5m/s)^2

m's cancel

assume everything I have put in there is correct. The answer to H(i)=0.57

Even though we got this , our roller coaster using marbles does not complete this. So we had to extend the initial hill ; which is what our teacher wanted us to do. We extended it 1.1 more meters. So now it asked for the percentage to raise the starting point.

Which we did , we used the percent error but we keep getting like 64%

Help would be nice

Thanks