Spring Compression??? (Mastering Physics Problem 10.69) 1. A 21.0 kg box slides 4.0 m down the frictionless ramp shown in the figure, then collides with a spring whose spring constant is 130 N/m. 2. 1. What is the maximum compression of the spring? (in meters) 3. I have attempted to determine the max compression of the spring by finding the Potential energy of the block [Ug=mgh]. Then using the potenital energy of the block [Ug = Us] (potential energy of the srping) to find the distance the spring compresses [Us=(1/2)k(∆s)^2]. I messed up on my calculations and found 3.3 meters was close. I found that by calculating Ug=(21kg)(9.8m/s^2)(cos(30))...the height should be sin(30) so I don't know how I got close. Any suggestions?