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for this problem we need a perpendicular distance from point (5,-1,-1) to the axis AB..
drs of line AB are 2i -2j +k
eq of AB can be written as
r = i -2j +k + k(2i -2j +k) .........................1
now find general point in this line ,then find drs of line through this point and (5,-1,-1)
since AB and this line are perpendicular so dot product of drs is 0..
now u will get value of k for find this general point and by distance formula find perpendicular
distance...let dis distance is r..
then velocity at this point=wr
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