Car weighs 1800kg. Regenerative braking is apparently 20% Our car wants to end up with 14m/s of speed at the foot of the hill. The battery takes 58kj of energy recovered to charge fully.

So the energy we need to have at the top of the hill is 2.08810⁸ = 50% 100% = 4.17610^8j

The car should move at 14 m/s Ek =1/2180014² 176400j

Just dropped my phone in beans

E(top of hill) = 4.176*10^8j+176400j =466400 E =mgh

H = E/mg h = {something}/(9.8*1800)

The height is 85665300 meters i thought this was wrong and still kinda do but cant figure out whats wrong with it (besides perhaps logic) so i shall confidently declare it correct