A block of mass 2.0 kg is released from rest on a slope. It travels 7.0 m down the slope and falls a vertical distance of 3.0 m. The block experiences a frictional force parallel to the slope of 5.0 N.
What is the speed of the block after falling this distance?

4.9 ms$^{-1}$
2 )
6.6 ms$^{-1}$
3 )
8.6 ms$^{-1}$
4 )
10 ms$^{-1}$
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