equilibrium rotational motion

Question

A see-saw is balanced on its

midpoint. A 22. 4 kg kid sits on the

left. 1.75 m from the axis

second kid sits on the other side

1.22 m from the axis. What is the

mass of the second kid?

Answer 1

Let m be the mass to be determined. Sum moments about the axis of rotation such that 22.4x1.75= mx1.22. Solve for m where m= 39.2/ 1.22 and m= 32.1kg.