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in JEE by (15 points)
The position of their centre of mass from A is

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1 Answer

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formula for COM is = mass of A (distance from the line we want to find COM) +mass of B (d from line)+ mass of C (d from line) / mass of( A+B+C)

as all spheres are identical so mass will be same of all 3

now there can be 2 ways of approaching this question

first one if we find COM from the line passing through center of sphere of A then its distance from line will be 0

so m(0)+m(2R)+m(4R) / 3m = 2R

second one if we are finding it from the line A is starting then distance of center of A will be R so m(R)+m(3R)+m(5R) / 3m= 3R

hope it will help you

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