Mass hangs in equilibrium on a spring. NEED HELP?

Posted on 2016-02-20 14:03:00 in Physics by PHELISA

Here is the question: 
A mass M hangs in equilibrium on a spring. M is made to oscillate about the equilibrium position by pulling it down 10 cm and releasing it. The time for M to travel back to the equilibrium position for the first time is 0.5s. Which line, A to D, is correct for these oscillations? 
A) Amplitude(cm) 10 , Period(s) 1.0 
B) Amplitude(cm) 10 , Period(s) 2.0 
C) Amplitude(cm) 20, Period(s) 2.0 
D) Amplitude(cm) 20, Period(s) 1.0 

Not sure which formula to use or how to go about answering the question. An explanation would be appreciated. As always, thanks

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