What initial distance is Kathy’s book from the floor if the book contains 196 J of potential energy and has a mass of 5 kg? What is its velocity as it hits the floor?

It is d, all the other ones say incorrect answer .

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.