1. The problem statement, all variables and given/known data From point A, the marble rests at the height of 0.895 m. Then, it is released up to point B which has a height of 0.665 m. From point B to point C, the marble falls in a projectile motion. Calculate the Kinetic Energy on position B and the work done by friction from position A to position B. 3. The attempt at a solution Well, i know that energy is conserved from Point B to Point C because only conservative forces were acting on the marble. My problem is from position A to position B since i've got 2 unknowns, the KE in B and work done by friction. Since there is friction, The total energy in position A must be GREATER than the total energy in position B. PLEASE, HEEEEEEELP!