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Asked by ploganathan9 19th December 2019, 5:16 PM
Answered by Expert
Answer:

 
 
A boy is sitting at a distance of 1.5 m from one end. 
Plank of see-saw is 5 m long. 
The fulcrum of the see saw will be exactly at centre of plank i.e. 2.5 m 
Thus, load arm is 2.5 - 1.5 = 1m 
Thus, 
Load arm x load = effort arm x effort 
1 x 40 = EA x 25 
Thus, 
EA = 1.6 m 
Thus, the distance at which a girl must sit from other end is = 2.5 - Effort arm = 2.5 - 1.6 = 0.9 m 
Answered by Expert 19th December 2019, 6:03 PM
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