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**plz help, homework trouble, springs and ocilatory motion!**

## Homework Statement

The position of a an air-track cart that is oscillating on a spring is given by (16.5cm)cos[(15.0s-1)t].

At what value t after t=0 is the cart first located at x=4.6 cm?

## Homework Equations

x=Acos[(angular freqency)(t)+(phase constant)] i think is the only one but i dont get the question right, maybe its my math.

## The Attempt at a Solution

@=phase constant, w= angular frequency

comparing x= 4.6cm=(16.5cm)cos[(15.0s-1)t] to:

X=Acos[wt+@]

inserting the information we get

0.046m=0.165m*cos1.5(t)

0.278=cos1.5t

t=0.278s

but incorrect.