Question
the forces F1 and F2 are acting perpendicular to each other at a point and have resultant R. If force F2 is replaced by R2 - F12/F2 acting in the direction opposite to that of F2, the magnitude of resultant
Joshi sir comment
F12 + F22 = R2 (1)
now for second condition
F12 + [(R2 - F12)/F2]2 = R12 R1 is new resultant
on putting the value of R2 from first eq. we get
F12 + [ F22/F2]2 = R12
so R = R1