Let's say you weigh 70 kg. To balance a car with a mass of 1500 kg, you can use a lever defined by the mechanical advantage:
MA = (1500 × g)/(70 × g) = 21.43
where g is the standard gravitational parameter, equal to 9.81 m/s². The arm of the lever on your side should be 21.43 times longer than the arm on the car side. Read more