QUESTION $1$

The figure shows four situations $-$ one in which an initially stationary block is dropped and three in which the block is allowed to slide down frictionless ramps.

$($a$)$ Rank the situations according to the kinetic energy of the block at point $B,$ greatest first. $($b$)$ Rank them according to the speed of the block at point $B,$ greatest first.

I NEED FULL CALCULATION AND EACH STEP FOR BETTER UNDERSTAND $,$ please check the image