Question

The forces of $60\text{ N}$ and $80\text{ N}$ are in equilibrium at a point, acting at an angle of $90^\circ$ to each other. Find the magnitude of the third force?

• A. $100\text{ N}$
• B. $120\text{ N}$
• C. $140\text{ N}$
• D. $160\text{ N}$

Hint:

This is a standard $(3, 4, 5)$ right-triangle ratio scaled by a factor of $20$:
$3(20) = 60\text{ N}$
$4(20) = 80\text{ N}$
$5(20) = 100\text{ N}$ (Resultant/Third force magnitude)

Answer 1

The Correct Option is A