Two sleds are tied together with a stiff rope, as shown in the figure. The child sitting on sled 1 has a mass of31 kg, and the child sitting on sled 2 has a mass of 41 kg. Each sled has a mass of 40 kg. The coefficient of static friction between each sled and the snow is 0.22.

a) What is the greatest horizontal force someone could exert on sled 1 without moving either sled?

b) What is the magnitude of the tension in the rope between sled 1 and sled 2 when the sleds are pulled by the force calculated in part (a)?