How Do You Calculate Frequency and Period for a Mass on a Spring?

[Brownie7]

Waves and Sound Vibrations Question Urgent Please Help??

Homework Statement

A mass suspended from the end of a spring vibrates up and down 25 times in 50s. What ar ethe frequency and period of the vibration.

Homework Equations

F = 1/T
T = 2(pie)3.14(squrroot)L/g

The Attempt at a Solution

F = 1/T
or is it:
F = 50/25
F = 2Hz?

T = 2(3.14)(sqrroot) but what is the L?

I'm very confused and I need to finish this soon!

 

[rl.bhat]

Frequency = number of vibrations per second.
Period T = time for one vibration = 1/f