일반물리학 1 — Potential Energy and Conservation of Energy: Problem 47

47 A small block of mass 1/4 kg has an initial kinetic energy of 500 J while moving over the frictionless surface shown in Fig. 8-40. (a) Find the kinetic energy of block at Q. (b) If we assume that the potential energy at P is equal to zero, what is the potential energy of the block at R? (c) Find the speed of the block at R. (d) Find the change in the potential energy as the block moves from Q to R.