Find the frequencies and modes for 4 equal masses with equal springs with k = 1. Interpret the modes. Find the frequencies and modes for non-identical masses with equal springs with k = 3 in the following cases. How does unequal masses affect the modes? (a) Two masses with m1 = 2 and m2 = 1. (b) Three masses with mi = 3, m2 = 1 and m3 = 2.