Physics, Energy Problems (confused!)
1) a 2000 kg rollercoaster starts from a height of 55 m and an initrial velocity of 8 m/s. When it reaches the bottom of the hill (height of zero), what is its velocity?
2) For the rollercoaster problem above (m=2000kg), if the final velocity at the bottom of the hill was only 27 m/s instead of 34 m/s, how much energy would have been "lost"? (Lost mechanical energy is the Eother)
I got 427,000J for the 2nd probem, but according to my teacher it's 435,000J. Was that simply a mistake?