(1 – r)dr- (1/2)2

3.1.1 For a bar with constant c but with decreasing f-|-x, find w(x) and u(x) as in equations (8-10). 3.1.2 For a hanging bar with constant f but weakening elasticity c(x)-1-, find the displacement u(x), The first step w even at x – I where there is no force. (The condition is w – c du/dx-0 at the free end, and (1 -x)f is the same as in (9), but there will be stretching c=0 allows du/dx 0 .)