A sprinter of mass 75 kg starts a race with an acceleration of 4.1 m/s². What is the magnitude of the net force on her? Include units as appropriate.

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Two teams of nine members each engage in a tug of war. The first has an average mass per member of 69 kg and exerts an average force of 1320 N horizontally. The second has an average mass

per member of 73 kg and exerts an average force of 1365 N horizontally. Treat the mass of the rope to be negligible and the rope to be inextensible. Include units as appropriate below.

(a) What is the magnitude of the acceleration of each team?

(b) What is the tension in the section of rope between the two teams? (It is helpful to sketch and analyze a free body diagram for each team.)

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A nurse pushes a cart by applying a force on the handle at a downward angle of 28° below the horizontal. The loaded cart has a mass of 28.0 kg and the force of friction between the cart and the

ground is 60 N. What magnitude of force is needed for him to push the cart at a constant velocity? Include units as appropriate.

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