Physics
posted by Mr superman .
Marcus and Santa are sliding down a snowy hill that is 13.3 m high. On the hill itself friction and air resistance can be ignored. At the bottom of hill the sled hits a long patch of rough snow that slows the sled down by exerting an average force of 170 newtons. Santa marcus and the sled together are 80 kg. How fast Is the sled traveling after sliding for ten meters on the rough snow?

mgh=170*10+1/2 m v^2
solve for v.