I have a physics problem. I can't seem to find a way to solve it.
A cart of mass 500 kg is rolling with a speed of 5 m/s on a railway track. There is very little friction between the tracks and the cart. You apply a constant force on the cart in the direction opposite to its velocity. From the moment you start applying the force, the cart moves 30 m before coming to a stop. What was the approximate magnitude of the force you applied?