Two people, Mary and John, are sliding a 225 kg crate straight forward along the floor. The force applied by Mary is 12.0 N, directed at an angle of 30.0 downwards from the horizontal. The force applied by John is 10.0 N directed at 40.0 above the horizontal. The magnitudes and directions of these forces do not change as the crate moves. The floor and the crate make frictionless contact. (a) Draw a force diagram for the crate in this situation. (1 mark) (b) What is the nett work done on the crate by Mary and John during a displacement of 8.50m? (1.5 marks) (c) During the 8.50m displacement what is the work Wg done on the crate by the gravitational force and what is the work WN done on the crate by the normal force from the floor? (1 mark) (d) The crate was initially stationary. What is its speed at the end of the displacement of 8.50m? (1.5 marks)