A 100 kg crate is being pushed across a horizontal floor by a force that makes an angle of 30.0° below the horizontal. The coefficient of kinetic friction is 0.2. What should be the magnitude of the force, so that the net work done by it and the kinetic frictional force is zero?

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Q: what is the work done by the pushing force, in Joules? b) What is the mass of the box, in kilograms?

A: