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A Runner Wearing Spiked Shoes Pulls A 20 Kg Sled Across Frictionless Ice Using A Horizontal Spring With Spring Constant 150 N/m. The Spring Is Stretched 20 Cm From Its Equilibrium Length. What Is The Acceleration Of The Sled? - Math Discussion

A runner wearing spiked shoes pulls a 20 kg sled across frictionless ice using a horizontal spring with spring constant 150 N/m. The spring is stretched 20 cm from its equilibrium length. What is the acceleration of the sled?