A block oscillating on a spring has period T = 2.8 s

A block oscillating on a spring has period T = 2.8 s. (Note: Do not assume any particular values for m or k. The required analysis involves thinking about ratios.)

a) What is the period if the block’s mass is doubled?
b) What is the period if the value of the spring constant is doubled?
c) What is the period if the oscillation amplitude is halved while m and k are unchanged?