Question

If there are two vectors of magnitude 3 unit and 5 unit and their resultant is perpendicular to the vector of magnitude 3 unit find the angle between two vectors

Answer 1

Answer: theta=53 degrees

Explanation: since the resultant is perpendicular to 3 unit so the two vectors and resultant would form a right angle triangle with hypotenuse=5units and base =3 units leading the third side to be 4 units . A/Q theta is angle between 5 unit vector and 3 unit vector . So cos(theta) =3/5 and this implies that theta=53 degrees.