PLEASE help it’s due in 10 minutes if the mass of the object is tripled and the speed is doubled then the kinetic energy will change by a factor of:

a. 3
b. 6
c. 8
d. 12

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.