Atraditional unit of length in japan is the ken (1ken =1.97 m) . what are the ratios of (a) square kens to a square meters? and (b) cubic kens to cubic meters? what is the volume of a cylindrical water tank of a height 5.50 kens and radius of 3.0 kens in (c) cubic kens and (d) cubic meters?

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.