The pipe is stuck in the ground so that when it is pulled upward the frictional force along its length varies linearly from zero at B to f_max(force/length) at C. Determine the initial force P required to pull the pipe out and the pipe€™s elongation just before it starts to slip. The pipe has a length L, cross-sectional area A, and the material from which it is made has a modulus of elasticity E.

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L. fmax