From what height would a car have to be dropped ?

Question

From what height would a car have to be dropped in order to have the same kinetic energy that it would have when being driven at 1.00 x 108 km/hour?

I tried v*v/2g (since mgh = mv*v/2). Can;t see where I've made a mistake. Also converted km/hr to m/sec and used g=9.8m/s2

Answer 1

FROM 38000FT  

Answer 2

11000 meters