The vectors \(a=x \hat{i}-2 \hat{j}+5 \hat{k}\) and \(b=\hat{i}+y \hat{j}-z \hat{k}\) are collinear, if
A. x =1, y = -2, z = -5
B. x= 1.2, y = -4, z = -10
C. x = -1/2, y = 4, z = 10
D. All of these
Answer:D
The vectors \(a=x \hat{i}-2 \hat{j}+5 \hat{k}\) and \(b=\hat{i}+y \hat{j}-z \hat{k}\) are collinear, if
A. x =1, y = -2, z = -5 B. x= 1.2, y = -4, z = -10 C. x = -1/2, y = 4, z = 10 D. All of these