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## Homework Statement

A 0.2 kg object, suspended from a spring with a spring constant of k = 10 N/m, is moving in simple harmonic motion and has an amplitude of 0.08 m. What is its velocity at the instant when its displacement is 0.04 m?

## Homework Equations

v=root(F/m/l)

## The Attempt at a Solution

i did v=root(9.8*.2/.2/.04) and this gave me 15.65, but the answer is 40 cm. how? please help; i do not understand this at all. also, can you please help on thsi question? i feel stupid.

https://www.physicsforums.com/showthread.php?p=3127238#post3127238