(adsbygoogle = window.adsbygoogle || []).push({}); The problem statement, all variables and given/known data

A mass is oscillating on a spring with a period of 4.35 s. At t = 0 the mass has zero speed and is at x = 3.25 cm. What is the magnitude of the acceleration at t = 1.30 s?

The attempt at a solution

The formula for oscillatory acceleration is

a(t) = -Aω^2cos(ωt - ∅)

a(x) = -(ω^2)x

ω = 2pi/period, which is 2pi/4.35

So,

a(t) = -(2pi/4.35)(3025cos((2pi/4.35)(1.30)))

a(t) = 0.6798 m/s^2

This isn't the correct answer.

The question states that it starts at t= 0 at x=3.25, so I took that to be A. Is that my problem? Where am I going wrong?

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# Homework Help: Find Acceleration At Time t For Mass on a Spring

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