• 1. We have a crate of mass 40.5$40\mathrm{.}5$ kg on an inclined surface, with a coefficient of kinetic friction 0.285.$0\mathrm{.}285.$ Instead of pushing on the crate, you let it slide down due to gravity. What must the angle of the incline be,$,$ in order for the crate to slide with an acceleration of 6.36$6\mathrm{.}36$ m/$/$s²?$^2?$ 

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• $4.$2. A block of mass 1.79$1\mathrm{.}79$ kg is placed on a frictionless floor and initially pushed northward, whereupon it begins sliding with a constant speed of 5.58$5\mathrm{.}58$ m/$/$s.$.$ It eventually collides with a second, stationary block, of mass 3.55$3\mathrm{.}55$ kg,$,$ head−$-$on,$,$ and rebounds back to the south. The collision is 100%$100\%$ elastic. What will be the speeds of the 1.79−$1\mathrm{.}79-$kg and 3.55−$3\mathrm{.}55-$kg blocks, respectively, after this collision? 

 

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Answer rating: 100% (QA)

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