A $2.0\,\text{kg}$ block is let go from rest on an incline. It moves $7.0\,\text{m}$ along the slope and loses a vertical height of $3.0\,\text{m}$. The block is acted on by a frictional force of $5.0\,\text{N}$ parallel to the slope. What speed does the block have after descending this distance?
- A$4.9\,\text{m s}^{-1}$
- B$6.6\,\text{m s}^{-1}$
- C$8.6\,\text{m s}^{-1}$
- D$10.1\,\text{m s}^{-1}$