April 5th, 2019, 08:12 AM  #1 
Member Joined: Feb 2018 From: Iran Posts: 50 Thanks: 3  Mass spring system
When a mass spring system is stretched 3cm from its equilibrium position , it starts to preform simple harmonic motion with frequency of 10Hz, at what instants does it first pass x=1.5cm

April 5th, 2019, 08:20 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,941 Thanks: 1545 
$f = 10 \, hz$ $B = 2\pi \cdot f$ position as a function of time in seconds ... $x(t) = 3\cos\left(20\pi \cdot t\right)$ set $x(t) = 1.5$ and solve for $t$ 

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