1. Hi! I am new to this forum. I was wondering if someone could help me with this problem. Thanks in advance!(adsbygoogle = window.adsbygoogle || []).push({});

A 0.27 kg mass is suspended on a spring that stretches a distance of 4.9 cm. The mass is then pulled down an additional distance of 12.5 cm and released. What's the displacement from the equilibrium position with the mass attached (in cm) after 0.42 s? Take up to be positive and use g = 9.81 m/s2.

2. Relevant equations

F=kx

ω(angular velocity)= (k/x)^0.5

3. The attempt at a solution

First I solved for k:

k=mg/x

k=(0.27*9.81)/4.9

k=0.54

Then I solved for the angular velocity:

ω=(0.54/0.27)^0.5

ω=squareroot 2

Then I tried to come up with an equation for displacement using the format:

x(t) = Asin(ωt)

i know that ω=root2

t=0.42

but how do i solve for A?? or what is A? should it be 4.9 or 12.5 or the sum of the two btw please correct me if im wrong in my calculation. thanks!

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Displacement in Simple Harmonic Motion

**Physics Forums | Science Articles, Homework Help, Discussion**