Given the two displacements D = (6i^ + 3j^ - K^)m and E = (4i^ - 5j^ + 8k)m
Find magnitude of displacement 2D - E
F = 2(6i^ + 3j^ - K^)m - (4i^ - 5j^ + 8k)m =
[(12 - 4)i^ + (6 + 5)j^ + (-2 - 8)k^]m
= (8i^ + 11j^ - 10k^)m
F = sqrt{Fx^2 + Fy^2 + Fz^2} =
sqrt{(8m)^2 + (11m)^2 + (-10m)^2 = 17m}
Nevermind. I understand now.