PLEASE HELP WITH THIS ONE QUESTION A bird lands on a bird feeder which is connected to a spring. The mass of the bird is exactly the same as the mass of the bird feeder. How does the added mass affect the period of oscillation of the bird feeder?

a) The period is less, but not halved.

b) The period is more, but not doubled.

c) The period is halved.

d) The period is doubled.