## Physics: Principles with Applications (7th Edition)

a. $x=\pm 62.2 units$ b. The unknown vector is (-142.2, 65).
a. Use the Pythagorean theorem to find the 2 possible x components. $$(x)^{2}+(-65)^{2} =(90)^{2}$$ $$x=\pm 62.2 units$$ b. Sum the vectors, with the second vector to be determined. (62.2, -65) + (Vx, Vy) = (-80, 0) The unknown vector is (-142.2, 65).