Question

Two forces p and q are acting at a point are such that if p is reversed the direction of the resultant is turn through 90 degree .Prove that theagnitude of forces are equal

Answer 1

Explanation:

the resultant force in the direction of

P+Q

If one of the force is reversed then resultant force P-Q

(P+Q).(P-Q)=0

P^2 +P.Q - Q.P+ Q^2-Q^2=0

P^2=Q^2

P=Q

hence proved