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a 17.1-kg crate starts at rest at the top of a 60 degree incline. The coefficients...

a 17.1-kg crate starts at rest at the top of a 60 degree incline. The coefficients of frictuon are us=.400 ans uk=.300. The crate is connected to a hanging 8.00kg box and an ideal rope and pulley.
a) as the crate slides down the incline, what is the tension in the rope?
b) How long does it take the crate ti slide 2.00m down the incline?
c) to push the crate back up the incline at a constant speed, with what force should you push on the crate ? (parallel to incline)
d) what is the smallest mass that you could substitute for the 8.00 kg box to keep the crate from sliding down the incline?

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