A suitcase rides up a long escalator that rises at a constant angle above the horizontal

PHYSICS · Single correct · CBSE · Physics · Work and Energy · Work and Energy

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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