Question

Two forces are such that the sum of their magnitudes is 18 N and their resultant is 12 N which is perpendicular to the smaller force. Then the magnitudes of the forces are

(a) 12 N, 6 N 

(b) 13 N, 5 N

(c) 10 N, 8 N 

(d) 16 N, 2 N.

Answer 1

(b) : Resultant R is perpendicular to smaller force Q and (P + Q) = 18 N