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## Homework Statement

7. Mass m is oscillating on the end of a spring. How much mass must be added in order for the

period of oscillation to increase by a factor of two?

A.m

B.2m

C.3m

D.4m

E.8m

## Homework Equations

f=-kx

w= [tex]\sqrt{k/m}[/tex]

T = 2[tex]\pi[/tex][tex]\sqrt{m/k}[/tex]

## The Attempt at a Solution

since period (T) is proportional to the square root of m and we want 2t, i had 2T=[tex]\sqrt{m}[/tex] so 2^2 =4

the given answer is 3 and i dont know how this was chosen