physics

An 0.90 kg object is attached to one end of a spring, and the system is set into simple harmonic motion. The displacement x of the object as a function of time is shown in the drawing. With the aid of these data, determine the following values.

I got a,b,d,e right.

for C, I used:
ω = k / m . Solving for k we find
k = ω
2m = (1.6 rad/s)
2
(0.90kg) = 2.30 N/m

but Webassign is telling me that I got it wrong.

i got 1.6 from ω =2π/T
=
2π/4.0 s
= 1.6 rad/s
(From the graph, the period is T = 4.0 s)

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asked by Lola

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