Question

A large spring is placed at the bottom of an elevator shaft to minimize the impact in case the elevator cable breaks. A loaded car has mass 480 , and its maximum height above the spring is 11.8 . In order to minimize the shock, the maximum acceleration of the car after hitting the spring is 4. solve for the spring constant k

Answer 1

You need to include units with your numbers. That is one the first things you should have learned about physics.