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Problem 5.70 5 of 7 > A Review Constants A6.00 kg box sits at rest at the bottom of a ramp that is 9.00 m long and is inclined at 30.0° above the horizontal. The coefficient of kinetic friction is uk = 0.40, and the coefficient of static friction is He = 0.43. Part A What constant force F. applied parallel to the surface of the ramp, is required to push the box to the top of the ramp in a time of 4.00 s? Express your answer to four significant figures and include the appropriate units. F = 55.5 N Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining