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## Homework Statement

## Homework Equations

PE = mgh

KE = [itex]\frac{1}{2}[/itex]mv[itex]^{2}[/itex]

W = ΔKE

W = Fd

## The Attempt at a Solution

g = 9.80m/s[itex]^{2}[/itex]

hi = ?

hf = 20.0m

PEi + KEi = PEf + KEf

mghi = mghf

Would you then cancel the masses out? If you did, the initial height would be 20.0m. Am I right? Thanks in advance to anyone who helps.