Question

Rama is sitting at a distance of 3 m from the middle of a see-saw. Where should Peter sit so as to balance the see-saw?(Given mass of Rama = 18 kg and mass of Peter = 20 kg)

 

1) 2.7 m from the centre of see-saw

 

2) 3 m from the centre of see-saw

 

3) 5 m from the centre of see-saw

 

4) 3.3 m from the centre of see-saw

​

Answer 1

The answer is 3.3 m from the centre of see-saw

Answer 2

Answer:

Let the distance of 40 kg. from the mean position be 'x' m.

Using principle of moments,

30×2=40×x

x=1.5m.

A boy of mass 40 kg should sit at 1.5m from the middle of see-saw.