In what distance will a car traveling with 100 kn stop if a force of -200n is applied?

The descriptions of both the car's motion and of the proposed action are
defective, so the question is unanswerable.

-- The car's motion could be described in terms of its speed or its kinetic
energy, but "100 kN" is meaningless as a description of motion.

-- To describe a force as negative ("-200N") is meaningless as long as
neither a frame of reference nor a positive direction has been defined.

As soon as the spring is stretched or compressed, there is positive potential energy stored in the spring. Learn more. For deeper explanations of elastic potential ...

Explanation:

As soon as the spring is stretched or compressed, there is positive potential energy stored in the spring. Learn more. For deeper explanations of elastic potential ...