## Question

###### PROBLEM:A block of mass m = 8 kg is attached to an elastie spring of force constant k = 4000 Nlm as shown in the ligure:The spring (with the block attached) stretched by 4 = 0.10 m and released. The friction force acting 0n the block by the surface is Fr = 40 N_ a-) Find the work done by the friction force as the spring returns from the stretched position (x = 0.10 m) to equilibrium position (x = 0): b-) How much the mechanical energy decreased as the spring returns from the stretched position (

PROBLEM: A block of mass m = 8 kg is attached to an elastie spring of force constant k = 4000 Nlm as shown in the ligure: The spring (with the block attached) stretched by 4 = 0.10 m and released. The friction force acting 0n the block by the surface is Fr = 40 N_ a-) Find the work done by the friction force as the spring returns from the stretched position (x = 0.10 m) to equilibrium position (x = 0): b-) How much the mechanical energy decreased as the spring returns from the stretched position (x = 0.10 m) to equilibrium position (x = 0)? c-) Find the speed of the block as the spring returns to equilibrium position (x = 0). Xi Xf

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