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You need to know the coefficient of friction between the ramp and the cart.

Q: What is the magnitude of the external force f necessary to hold the cart motionless at point c...2 kg. cart going up ramp of 10 meters slanted at 30 degrees. the ramp is 5 meters high?

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If the directions of two vectors with equal magnitudes differ by 120 degrees, then the magnitude of their sum is equal to the magnitude of either vector.

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no. only at -273 degrees is everything motionless

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If the directions of two vectors with equal magnitudes differ by 120 degrees, then the magnitude of their sum is equal to the magnitude of either vector.

69 degrees

More information is required to answer the question. There are degrees that universities give, degrees of temperature scales, degrees for angles, degrees meaning magnitude (degrees of separation).

There are 180 degrees in every plane triangle.

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A point has no dimensions and no magnitude and so it has no degrees.