Four crates being pushed across a warehouse floor, assume the same coefficients

Question

Four crates being pushed across a warehouse floor, assume the same coefficients of friction in each case.
Case "0" (original) A constant horizontal pushing force of 50 N causes a crate to slide across a floor at a constant speed of 4.0 m/s. The crate has a mass of 10 kg.
Case "D" (double) The second crate has a mass of 20 kg and is pushed by two horizontal 50 N forces.
Case "F" (frictionless) The third crate is pushed with a horizontal force of 50 N, has a mass of 20 kg, but moves frictionlessly across the floor due to small, massless wheels.
Case "A" (angled) The fourth crate (mass 10 kg) is being pushed by 75 N at a 45° angle - above the horizontal.
If these four (0, D, F, and A) race across the long warehouse, what will be the order of finish?

Explanation / Answer

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