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A 1.1 kg mass compresses a spring by a distance 0.25 m. The mass is released...

A 1.1 kg mass compresses a spring by a distance 0.25 m. The mass is released from rest. The mass travels over equal patches of rough surfaces with coefficient of friction μk=0.15 and length 0.5m. If the spring constant of the spring is 770 N/m, how many (including the decimal fraction) mats does it take to stop the mass?

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