A A = = + ) + @ SOLVE USING COSINE EQ (below) to find x(t); o must be in radians |x(t) = x, cos@t + 0 sin @t = Acos(@t-) A) X0=7 cm x=17 mm M=78 kg K=180 N/m @n B) A xo = tan = tan A x@ -2 Quadrant (+'-) Quadrant (+'+) 0 1 2 X0=24 cm xo=57 cm M=42 kg K=1 kN/m c) X0=100 cm x=57 mm M=1000 kg K=1075 N/m Quadrant (-'-) HINT: Tan-1 Negative Y Positive X Quadrant IV (-'+) 4th Quadrant xo Initial displacement xo Initial velocity