Martin caught a fish and wanted to know how much it weighed, but he didn’t have a scale. He did, however, have a stopwatch, a spring, and a 4.90 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. 

(a) Before answering part (b), determine whether the fish weighs more or less than 4.90 N. Explain your reasoning. 

(b) What is the weight of the fish?