I am deleting my account so here is some points
2 answers:
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Answer: The center of gravity is 1.1338 m away from the left side of the barbell
Explanation:
Length of the barbell = 1.90 m
The distance center of gravity from left = x
Mass on the left side = 25 kg
The distance center of gravity from right = 1.90 - x
Mass on the right side = 37 kg
At the balance point:
The center of gravity is 1.1338 m away from the left side of the barbell
As per initial given conditions first we will find the initial potential energy of the feather
now we know that few amount of its initial energy is lost in form of frictional energy loss
so remaining energy will be less than the initial potential energy
So final answer would be
<u><em>A. KE < 0.0196 J</em></u>