How long will it take for the mass's speed to drop from 16 m/s to 4 m/s...

Ham

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...traveling up the slope? A block of mass, m, is projected up a slope at 16 m/s. The coefficient of dynamic friction is 0.15 and the slope is 15 degrees. How long will it take for the mass's speed to drop from 16 m/s to 4 m/s?
 
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