Martin caught a fish and wanted to know how much it weighed, but he didnt have a scale. He did however have a stopwatch, a spring, and a 4.6 N weight. He attached the weight to the spring and found that the spring would oscillate 20 times in 65 s. Next, he hung the fish on the spring and found that it took 220 s for the spring to oscillate 20 times. What is the weight of the fish??? I know that omega=sqaure root of (k/m) However, I just have no idea how to start or apply this equation to solve this problem.