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February 28, 2015

Homework Help: Physics

Posted by Jacob on Tuesday, April 13, 2010 at 4:21pm.

A student gets a 2.9 kg mass to oscillate up and down on bottom of a light vertical spring by pulling her hand up and down on the top end of the spring. The spring is a real spring with a spring constant of 93 N/m and a damping constant of 0.7 N sec/m.

(b) The student now stops moving her hand and the mass slowly comes to rest. How long after she stop shaking her hand will it take for the amplitude of the mass to reach one half its maximum amplitude?

Tried the formula 2pi(m/k)^2 but not working, don't know what to do... help

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