Find a vector of the same magnitude but in the opposite dire

Find a vector of the same magnitude but in the opposite direction to the vector v=0.4i7.8j2.6k

Solution

Solution:- Given v = 0.4i - 7.8 j - 2.6 k

Let OA = 0.4i - 7.8 j - 2.6 k

Let OB is the vector of same magnitude but in opposite direction, then

OA = - OB

Hence the vector with same magnitude but in opposite direction is

- (0.4i -7.8 j -2.6k) = -0.4i + 7.8 j +2.6 k