Physics

Physics

Problem

A 15 kg15\,\text{kg} suitcase rides up a 9.0 m9.0\,\text{m} long escalator that rises at a constant 30∘30^{\circ} angle above the horizontal. A constant 35 N35\,\text{N} frictional force opposes the suitcase’s motion along the escalator. What is the work done by the friction force while the suitcase moves from the bottom to the top? a) −2.7×102 J-2.7\times10^{2}\,\text{J} b) +3.2×102 J+3.2\times10^{2}\,\text{J} c) −3.2×102 J-3.2\times10^{2}\,\text{J} d) −1.6×102 J-1.6\times10^{2}\,\text{J}

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