Question

- A uniform plank of a sea-saw is 5 m long supported
at its centre A boy weighing 40 kgf sits at a
distance of 1 m from the fulcrum. Where must a
girl weighing 25 kgf sit, so as to balance the plank?​

Answer 1

Answer:

balance torque about the axis of rotation

Explanation:

$torque = f \times d$

d is perp dist of pt of applicn of force from axis