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There is a sled of mass 5.2 kg on a rough surface. A string pulls with a tension of 45.3N at an angle of 40

There is a sled of mass 5.2 kg on a rough surface. A string pulls with a tension of 45.3N at an angle of 40 degrees above the horizontal. The sled remains at rest all the time.

a) What is the magnitude of the friction?

b) What is the normal force?

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