Physics class 11 Vector

Question

Q. Two boys raising a load pull at an angle to each other. If the exerts forces of 30N and 60 N respectively and their effective pull is at the right angle to the direction of the pull of the first boy, then what is the angle between their arms ? What is their effective pull?

Answer 1

$$\text{Angle between two Forces} = 90 + \sin^{-1}(\frac{30}{60}) = 120 \ \text {deg}$$

$$R = \sqrt{60^2 - 30^2} = 51.962N$$