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(Solved): 5. A 2-kg wooden block slides on the surface shown in the figure below. The c ...



5. A 2-kg wooden block slides on the surface shown in the figure below. The curved sides are frictionless, but the horizontal???????

5. A 2-kg wooden block slides on the surface shown in the figure below. The curved sides are frictionless, but the horizontal bottom is rough and has a length of \( 30 \mathrm{~m} \). The block starts from rest \( 4 \mathrm{~m} \) above the rough bottom and eventually comes to rest due to friction. For the motion from the initial release until the block comes to rest, what is the total amount of work done by friction? Wood Rough bottom A. \( -30 \mathrm{~J} \) B. \( -80 \mathrm{~J} \) C. \( -120 \mathrm{~J} \) D. \( -60 \mathrm{~J} \) E. impossible to calculate without knowing the coefficient of kinetic friction between the wooden block and the rough bottom Ans: B


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To calculate the total amount of work done by friction, work energy the
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