Three vectors of magnitudes 3, 4 and 5 have zero resultant. Find the angle in degrees between the vectors of magnitudes 3 and 4.
Physics · Mathematical tools and vector · Vector
NEET JEE Mains

Question

Three vectors of magnitudes 3, 4 and 5 have zero resultant. Find the angle in degrees between the vectors of magnitudes 3 and 4.

G1 Physics · Accepted Answer

For the third vector of magnitude 5 to cancel the resultant of the first two, their resultant must be 5. Thus 5²=3²+4²+24 cosθ, giving cosθ=0 and θ=90°.