# Homework Help: EASY speed of curve PROBLEM

1. Nov 20, 2006

### 8parks11

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.

2. Nov 20, 2006

### lotrgreengrapes7926

$$v=\sqrt{980\tan68^\circ}\approx49.25$$

3. Nov 20, 2006