Question 851159
The displacement from the equilibrium of an oscillating mass attached to a spring is given by y(t)=4 cos 3pi(t) where y is measured in inches and t in seconds.  Find the displacement at the times indicated.

   t   |y(t)|                   |y>0
0.00   |    |                   |Equilibrium, y=0
0.25   |    |                   |y<0
0.50   |    |   
0.75   |    |
1.00   |    |
1.25   |    |
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It's y(t) = 4cos(3pi*t)
sub the values of t and find y
t = 0, y = 4
t = 0.25, y = -2.828
t = 0.50, y = 0
etc
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3pi*t is in radians I think, tho that should be specified