Big sister and little brother have just finished filling a crate with rocks from their garden. The crate of rocks has a mass of 11.0 kg and now must be moved. Big sister pulls on a rope attached to the crate with a force of 71.0 N. She pulls such that her helping by pulling on a rope attached to the opposite end of the crate. He pulls with rope makes an angle of 1 = 25.0 above the horizontal. Little brother is not As a result, the crate is dragged to the right a distance of 3.50 m across the level ground. The coefficient of kinetic friction between the crate and the ground is a force of 28.0 N and his rope makes an angle of 2 = 45.0 above the horizontal. 0.767. (a) Calculate the work done by big sister during this motion. (b) Calculate the work done by little brother during this motion. (c) Calculate the magnitude of the normal force on the crate. (d) Calculate the work done by the normal force. (e) Calculate the work done by the force of kinetic friction. (f) Calculate the work done by the force of gravity. (g) Calculate the net work done on the crate of rocks.