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1. A 5 kg crate is pulled 4 m along a horizontal floor by a constant force exerted by a person of magnitude 100 N, which acts at a 37' above the horizontal. The floor is rough and exerts a friction force of magnitude 50 N. Determine the total work done on the crate. 2. An object of mass 6 kg is pushed up a frictionless inclined plane by a force of magnitude 80 N that is acting parallel to the incline. The angle of inclination of the incline is 30'. If the object starts with a speed of 2.2 m/s, what is its speed after it has travelled 2.1 m