Question

if two vector a and b are anti parallel l then a×b​

Answer 1

Step-by-step explanation:

When you are dealing with vectors you have to mention product as dot product or cross product.

Consider a and b be two vectors that are anti parallel

implies a=-b and angle between them is 180°

Hence a.b=|a|*|b|*cos(180°)

i.e a.b=-|a|^2

Similarly a*b=|a|*|b|*sin(180°) n=0 (zero vector)

(here n is unit vector along a*b)