need help please!!?

Question

You push a 1.9 kg block against a horizontal spring, compressing the spring by 16 cm. Then you release the block, and the spring sends it sliding across a tabletop. It stops 80 cm from where you released it. The spring constant is 200 N/m. What is the block-table coefficient of kinetic friction?

Answer 1

The energy stored in the spring
.5*200*0.16^2
or
2.56 J

is converted to heat by the frictional work
1.9*9.81*µk*0.80
14.91*µk

set equal and solve for µk
µk=0.17

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