Final answer:
The spring will be compressed by 0.6 meters (or 60 cm) when the mass briefly comes to a stop.
Step-by-step explanation:
The spring compression is given by Hooke's Law, which states that the force exerted by a spring is proportional to its displacement from equilibrium. The equation is F = -kx, where F is the force, k is the spring constant, and x is the displacement. In this case, the force is zero when the mass briefly comes to a stop, so we can set F = 0 and solve for x. With a spring constant of 50 N/m, the spring will be compressed by 0.6 meters (or 60 cm) when the mass briefly comes to a stop.