plz help, homework trouble, springs and ocilatory motion! 1. The problem statement, all variables and given/known data 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? 2. Relevant 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. 3. 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.