Question

what happens when vectors are parralel?​

Answer 1

Explanation:

If the cross product comes out to be zero. Then the given vectors are parallel, since the angle between the two parallel vectors is 0∘ and sin0∘=0. ... Another way could be is to find if one vector is scalar multiple of the second vector or not, If u=ku,k is a constant and k≠0, then the vectors u and v will be parallel.

Answer 2

Hint: Two vectors A and B (say) are parallel if and only if they are scalar multiples of one another, i.e., A=kB,k is a constant not equal to zero or if the angle between the vectors are equal to 0∘.