Johnny stretches a spring 40 cm from its resting position. the spring’s constant of proportionality is 20 n/m. what is the spring potential energy?

j=

2.77 x 10^-3 its for plato user 

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.

Dshould be the right answer i think