Help me with a physics question (spring constant, period, and mass)

[From: ] [author: ] [Date: 11-12-13] [Hit: ]

Spring constant=135 N/m.Find the mass.m = (135)(1.m = 4.There you go, short and sweet.......

Period=1.2 seconds.
Spring constant=135 N/m.
Find the mass.
I don't know what equation to use :/

1/T = 1/2π√(k/m)
1/T^2 = k/(4π^2m)
m = kT^2/4π^2

m = (135)(1.2^2)/4π^2
m = 4.924 kg

There you go, short and sweet.

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