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A 0.7 kg block is pushed against a spring (k = 7.0 N/m) thereby compressing it...

A 0.7 kg block is pushed against a spring (k = 7.0 N/m) thereby compressing it by 34.0 cm, as shown in the figure above. After it is released the block travels a total distance of 39.3 cm before coming to rest.
What is the coefficient of kinetic friction for the horizontal surface

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Answer #1

Using law of conservation of energy,

-F d = - 0.5 kx^2

uk mg = 0.5 kx^2

uk = (0.5 x 7 x 0.393^2)/(0.7 x 9.8) = 0.079

Comment in case any doubt please rate my answer....

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