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## Homework Statement

A mass attached to a horizontal spring is pulled to the right at t=0. The mass passes x=+10 cm at t=0.3s with a velocity 85.7cm/s. What is a) frequency b)amplitude c) phase constant

## Homework Equations

Acos(ωt+phi)= x(t)

-ωAsin(ωt+phi)=v(t)

## The Attempt at a Solution

knowing that Acos(ω0.3+phi)= 10

-ωAsin(ω0.3+phi)=85.7cm/s

diving v(t) by x(t) gets

-ωtan(ωt+phi)=85.7/10=8.57s but

and for phi since at t=0 x I assume is A but I am not sure so 1=cos(0+phi) so phi would be zero

and amplitude is hard to find but it is the original stretched amount I think.