A0.450 kg baseball comes off a bat and goes straight up. at a height of 10.0 m, the baseball has a speed of 24.5 m/s.
determine its mechanical energy at this height.

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.