# If a #4 kg# object moving at #16 m/s# slows down to a halt after moving #800 m#, what is the friction coefficient of the surface that the object was moving over?

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The friction coefficient of the surface is approximately 0.8.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- Your body applies force to the ground as weight. If you weigh 450 newtons and carry a backpack that weighs 45 newtons, what is the net force applied downward to the ground?
- Two masses are in contact on a horizontal frictionless surface. A horizontal force is applied to #M_1# and a second horizontal force is applied to #M_2# in the opposite direction. What is the magnitude of the contact force between the masses?
- A truck pulls boxes up an incline plane. The truck can exert a maximum force of #5,700 N#. If the plane's incline is #(2 pi )/3 # and the coefficient of friction is #8/5 #, what is the maximum mass that can be pulled up at one time?
- An object with a mass of #1 kg# is pushed along a linear path with a kinetic friction coefficient of #u_k(x)= e^x-x+3 #. How much work would it take to move the object over #x in [1, 4], where x is in meters?
- What is the coefficient of friction?

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