Physics

Physics

Problem

A block attached to a light spring is displaced from equilibrium by the vector x=0.20 m i^+0.10 m j^\mathbf{x}=0.20\,\text{m}\,\hat i+0.10\,\text{m}\,\hat j. If the spring constant is 50 N ⁣/ ⁣m50\,\text{N}\!/\!\text{m}, which vector best represents the restoring force on the block at that instant? a) −10 N i^+5.0 N j^\phantom{-}10\,\text{N}\,\hat i+5.0\,\text{N}\,\hat j b) −5.0 N i^−10 N j^-5.0\,\text{N}\,\hat i-10\,\text{N}\,\hat j c) −10 N i^−5.0 N j^-10\,\text{N}\,\hat i-5.0\,\text{N}\,\hat j d) −10 N i^+5.0 N j^-10\,\text{N}\,\hat i+5.0\,\text{N}\,\hat j

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