As the car falls, it loses height and gains velocity. What is the kinetic energy of the car when it has fallen 500 m? What is its velocity?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.