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**1. Homework Statement**

A 2.00 kg mass vibrates according to the equation x = 0.470 cos 8.36t, where x is in meters, and t is in seconds. Assume that x = 0.29 m.

(a) Determine the amplitude.

.470

(b) Determine the frequency.

1.331

(c) Determine the total energy.

(d) Determine the kinetic energy.

e) Determine the potential energy.

**I did the first two parts (a-b), but I'm stuck on c,d & e, the questions about the Energy of the spring.**

**2. Homework Equations**

PE = .5kx^2

and

KE = .5KA^2

F/x=k

**3. The Attempt at a Solution**

I've tried these 3 multiple times and I keep getting them wrong. One thing I'm not sure of, is is "x" the amplitude? I have been plugging in .29 for the "x" and .47 for the "A", but just curious if this is the reason I'm getting these wrong.

I would think, that according to these formulas, KE+PE=TOTAL ENERGY, and I thought I was doing them right. I'm at my wits end.

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