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Q1. Pete slides a crate up a ramp with constant speed at an angle of 27 degrees by exerting a 133 N force parallel to the ramp. How much work has been completed against gravity when the crate is raised a vertical distance of 1.6 m? The coefficient of friction is 0.39.

Q2. Jonathan who is 60 kg driving his car at a speed of 25 m/s. He sees a dog crossing the road and so he steps on the break to avoid hitting it. His seat belt brings his body to stop in 0.40 seconds.

a.) What average force does seat belt exert on him?

b.) If he is not strapped to his seat belt and the windshield stops his head in 0.001, what average force would windshield exert on him?

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