The Linear Density of a Rod, in G/m, Is Given $\lambda=40.0+30.0 x$

Multiple Choice

The linear density of a rod, in g/m, is given by $\lambda=40.0+30.0 x$ . The rod extends from the origin to x = 0.400 m. What is the location of the centre of mass of the rod?

A) x = 0.213 m
B) x = 0.315 m
C) x = 0.384 m
D) x = 0.184 m
E) x = 0.208 m