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Divide the height of the ramp by the length of the ramp (rise over run).
c^2 = a^2 + b^2 c = sqrt(a^2 + b^2) = sqrt(40^2 + 81^2) = sqrt(8161) = 90 inches
a2 +b2=c2102 + 152 =c2c=18.03 feet
it is a relatively shallow ramp. every single unit that it gains in height, it makes an equivalent TEN units in length
The theoretical mechanical advantage is the length of the ramp divided by its height. 20/2=10.