A block rests while compressing a horizontal spring of force constant by

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

Problem

A 2.0 kg2.0\,\text{kg} block rests while compressing a horizontal spring of force constant 400 N m−1400\,\text{N\,m}^{-1} by 10 cm10\,\text{cm}. Neglecting friction, calculate the speed of the block as it crosses the spring’s natural length. (a) 2.0 m s−12.0\,\text{m\,s}^{-1} (b) 1.4 m s−11.4\,\text{m\,s}^{-1} (c) 2.8 m s−12.8\,\text{m\,s}^{-1} (d) 0.71 m s−10.71\,\text{m\,s}^{-1}

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