A sled with a mass of 5.80 kg is pulled along the ground through a displacement given by d(vector) = (4.55 m)x̂. (Let the x axis be horizontal and the y axis be vertical.)

(a) How much work is done on the sled when the force acting on it is F(vector) = (2.89 N) x̂ + (0.131 N)ŷ?

(b) How much work is done on the sled when the force acting on it is F(vector) = (2.89 N)x̂ + (0.231 N)ŷ?

(c) If the mass of the sled is increased, does the work done by the forces in parts (a) and (b) increase, decrease, or stay the same? Explain.