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[" 3.Three particles "A,B&" C start from...

[" 3.Three particles "A,B&" C start from the origin "],[" at the same time; A with a velocity "'a'" along "],[" x-axis,B with a velocity "'b'" along "y" -axis and "],[" C with velocity "^(6)" 'in "XY" plane along the line "],[" x "=y" .The magnitude of "^(6)c'" so that the three "],[" always remain collinear is: "],[[" 1) "(a+b)/(2)," 2) "sqrt(ab)," 3) "(ab)/(a+b)," 4) "(sqrt(2)ab)/(a+b)]]

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