Two children weighing 15 kg, wt and 25 kgwt. sit at the ends of a see-saw, pivoted at its centre. The see-saw is 4 m long. Where should a third child, weighing 20 kg wt. sit, in order to balance the see-saw? (Neglect the weight of the see-saw)

A boy of mass 30 kg is sitting at a distance of 2 m from the middle of a see-saw. Where should a boy of mass 40 kg sit so as to balance the see-saw ?

When a boy weighing 20 kgf sits at one end of a 4m long see saw, if gets depressed at this end. How can it be brought to the horizontal position by a man weighing 40 kgf.

Two children, weighing 30 kg and 15 kg sit on one side of a see-saw at a distance of 1m and 1.2 m respectively, from the fulcrum. A boy of 'M' kg sits on the other side of the see-saw at a distance of 1.2 m from the fulcrum, and the see saw is in equilibrium. Find M

A uniform seesaw, 5m long, is supported at its centre. A boy weighing 40 kgf sits at a distance of 1 m from the centre of the seesaw. (i) To which class of lever does it belong ? (ii) Find where a girl of weight 20 kgf must sit on the seesaw so as the balance the weight of the boy.

6 m long see-saw remains horizontal when two children weighing 20 kg and 30 kg respectively sit at two ends. Where is the see-saw supported?

6 m long see-saw remains horizontal when two children weighing 20 kg and 30 kg respectively sit at two ends. Where is the see-saw supported?

A see-saw of length 6m is pivoted at its centre. A child (A) of mass 20 kg is sitting at one end of the see-saw. Where should anolther child (B) of mass 30 kg, sit, so that the see saw is balanced?

Length of a uniform see-saw pivoted from the middle is 4 m. A boy weighing 50 kgf sits at onc end of this see-saw. Where should the father of this boy weighing 65 kgf sit to keep the see-saw horizontal? What class of lever this see-saw is?