A 7kg mass slides to the right on the surface having acoefficient of friction 0.25. The mass has a speed of 6 m/s whencontact i made with a spring that has a spring constant 115 N/m.The mass comes to rest after the spring has been compressed adistance d. The mass is then forced toward the left by the springand continues to move in that direction beyond the unstrechedposition. Finally he mass comes to rest a distance D to the left ofthe unstreched spring. D=4.66960m., d=1.338668 m.
The acceleration of gravity is 9.8 m/s2. Findthe speed Vf at the spring's unstretched positionwhen the mass is moving to the left. Answer in m/s.

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