If anyone here can me with physics comment. its about coulombs law

Ablock of mass 1.5 kg slides down an inclined plane that has an angle of 15. if the inclined plane has no friction and the block starts at a height of 3 m, how much kinetic energy does the block have when it reaches the bottom? acceleration due to gravity is g = 9.8 m/s2. a. 6.8 j b. 50.9 j c. 0 j d. 44.1 j

The energy equivalent of the rest mass of an electron is

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.