A15-kg crate (s moved along a horizontal floor by a warehouse worker who Is pulling on it with a rope that makes a 30° angle with the horizontal. The tension in the rope is 69 N, and the crate slides a distance of 10m. (a) How much work is done on the crate by the worker? Assume the coefficient of kinetic friction between the crate and the floor !s 0.4. (b). How much work is done by the normal force? (c). How much work is done by the friction force?