Amassless spring (force constant k1) is suspended from the ceiling with a mass m1 hanging from its lower end. a second massless spring (force constant k2) is suspended from m1, and a second mass m2 is suspended from the second spring’s lower end. assuming all motion is in the vertical direction, and using co-ordinates y1 and y2 show that the equations of motion can be written in matrix form, my ? = ? ky, where y is made up of y1 and y2. find the matrices m and k.