How to Make Key Respawn

so can somebody tell me how to make key respawn javascript
to my car game.

okay. i have car game where you need to crash other cars with your car.
if the car flip over then the game need to restart. so can somebody tell how to
make tha respawn key ?

This should be very easy if your player car is a prefab, just do the following:

if (Input.GetKey(KeyCode.R))