Q 11-03-016NEETJEE MainEasy
The greatest and least resultants of two forces acting at a point are $17$ N and $7$ N. The magnitude of their resultant when they act at right angles is
Answer: (A) $13$ N
Concept. Greatest resultant $A + B$, least $A - B$.
Step 1. Forces. $A + B = 17$, $A - B = 7$: $A = 12$ N, $B = 5$ N.
Step 2. At right angles. $\sqrt{144 + 25} = 13$ N.
Answer. $13$ N (Option A).
Solution by Sreeraj P, M.Sc Physics