Physics question. please help?

Posted on 2016-03-12 14:10:00 in Physics by LACK

A vertical spring with spring stiffness constant 305 N/m oscillates with an amplitude of 28.0 cm when 0.235 kg hangs from it. The mass passes through the equilibrium point (y=0) with positive velocity at t=0. Positive direction of y-axis is downward. 

A)hat equation describes this motion as a function of time? 
Express your answer in terms of t, where t is expressed in seconds. 

B)At what time will the spring stretch to its maximum length at first time? 
Express your answer with the appropriate units. 


C)At what time will the spring shrink to its minimum length at first time? 
Express your answer with the appropriate units.

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