What is the acceleration of a 10kg rock falling at a gravitational fiend of 10N/kg

This is kenetic energy.

Two cars collide, lock bumpers and move together after the collision.this collision is known as perfectly inelastic collision.

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.