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## Homework Statement

An air-track glider attached to a spring oscillates between the 9.23 cm mark and the 50.23 cm mark on the track. The glider completes 27 oscillations in 44.7 s. angular frequency of the glider? (in rad/s)

3.7933

what is the amplitude of the glider?

## Homework Equations

x=Acos(wt+ro)

## The Attempt at a Solution

I considered that at x=9.23 the amplitude was zero and so is ro.

Hence, x=50.23 would equal just 50.23 cm=Acos(3.79(44.7)). But A turned out to be negative. What am I doing wrong? How do I solve this problem? Thank you in advance.