how fast are formula e cars

Short answer: very. The latest Formula E Gen3 cars top out at around 320 km/h (on the right straight) and sprint 0–100 km/h in roughly 2.8 seconds. They unleash up to 350 kW in qualifying (about 300 kW in races) and recover up to 600 kW under regen, which is why the rear hydraulic brakes are mostly on holiday. On tight street circuits they rarely see v-max, but the shove out of hairpins is delightfully neck-tweaking. Figures vary with track, temps and software maps. Consult official documentation for exact figures.