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Q. You push a 1.8 kg block against a horizontal spring, compressing the spring by 26 cm. After that you release the block, and the spring sends it sliding across a tabletop. It stops 90 cm from where you free it. The spring steady is 370 N/m. What is the coefficient of kinetic friction between the block and the table?

Q. A 230-kg crate is pushed horizontally with a force of 680-N. If the coefficient of friction is 0.20, compute the acceleration of the crate.

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