# Amplitude of oscillating spring

#### hopperd

1. Homework Statement
a 185g mass attached to a horizontal spring oscilates at 5.2Hz. At t=0s, the amss is at x=5.80 and has a vx=-40.0cm. determine the amplitude

2. Homework Equations

3. The Attempt at a Solution

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#### tiny-tim

Homework Helper
welcome to pf!

hi hopperd! welcome to pf!

it's shm, so write a differential equation, and solve it with the given initial conditions …

what do you get?

#### hopperd

Thanks,
Thats the problem. I have tried 3 diff equations, and get the same answer, but it's the wrong one. So I must be missing something. What equation would you use?

#### tiny-tim

Homework Helper
hi hopperd!

show us your full calculations, and the official answer, and then we'll see what went wrong, and we'll know how to help!

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