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**EASY speed of curve PROBLEM!**

A race track curve has a radius of 100 m and is banked at an angle of 68 degrees. For what speed was the curve designed?

ok this is what i got

since tan angle = v^2/rg

i got tan 68 = v^2/rg

so tan 68 x rg = v^2

but this gave me an answer far from the actual answer of 49.

please help!