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Homework Statement
The mass of part of a wire is x(1+sqrt(x)) kilograms, where x
is measured in meters from one end of the wire. Find the
linear density of the wire when x=4m.
2. The attempt at a solution
Actually what i did was put in x = 4 in the mass equation given and divide by x since linear density = mass/length. And i get the answer to be 3.
But i don't know whether that's right or not.
Any help appreciated.