AP Physics B
posted by Charlie .
The position of a 20 g oscillating mass is given by x(t) = (2.0 cm) cos(2t), where t is in seconds. Determine the following.
The Amplitude (cm.)
The Period (s.)
The Spring Constant (N/m)
The maximum speed (cm/s)
The total energy (J)
The velocity at t=0.40 s. (cm/s)
I need your help, please help me guys. Thanks!

Well, all this is level one definition work. What is it you don't understand?

i figured out the amplitude and the period, i just don't kno how to get to the other 4 with using simple harmonic motion equations

spring constant:
Period=2PI sqrt (m/k)
max speed= 2*2
energy= 1/2 k x^2
velocity= 2*2 sin2t 
can u give me these in numbers please, i don't understand what formulas u wrote and what some of the stuff in ur formulas are

Then you are in great trouble in Physics B. You need to review periodic motion in your text.

how do yo find the spring constant?
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