# SHM Kinematics

1. Jan 4, 2006

### G01

Hi there I'm having a little trouble doing problems with SHM kinematics. I think its because I have yet to find a good method of solving them. I'll post one and show what I can do. Them I hope somone can help me find a good method to solving it.

A 1 kg block oscillates on a spring with k= 20 N/m. At t= 0s the block is 20cm to the right of equilibrium. and moving to the left with v= -100cm/s.
What is the Period?

All I can figure out is that $$\phi_0 = \cos^{-1} (\frac{x_0}{A})$$

And that $$T= 2\pi \sqrt{\frac{m}{k}} = 1.40s$$

Any hints at all? I can't seem to find any expression for the other variables that'll help, but maybe I'm forgetting some. Any help?

Last edited: Jan 4, 2006
2. Jan 4, 2006

### G01

WAIIIIIIIIIT A MINUTE I SOLVED THIS I forgot what i was solveing for sry!!!!!!

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