1. The problem statement, all variables and given/known data So, I need a little help with a few problems So, say a 2kg pine cone drops from a tree 41 meters high. If it hits the ground at 10m/s then how much was lost to entropy? Or A 1800kg roller coaster begins at the top of 190m hill, at what height will the velocity be 24m/s and what will be its kinetic energy when it reaches a height of 10m above the ground.? Thanks for any or all help. 2. Relevant equations Energy of work = Force times distance Gravitational potential = mgy Kinetic Energy = .5 time mass time velocity squared 3. The attempt at a solution For the 2nd one, I used mgy= .5 time mass time velocity squared but submitted 24 for the velocity to find y but I don't think it's right. For the 1st, I used mgy+.5 time mass time velocity squared to find the energy but don't know where to go from there.