An archer pulls her bowstring back 0.400 m by exerting a force that increases uniformly from zero to 200 N. (a) What is the equivalent spring

An archer pulls her bowstring back 0.400 m by exerting a force that increases uniformly from zero to 200 N.(a) What is the equivalent spring constant of the bow?1 N/m(b) How much work is done in pulling the bow?