A 22.8 N crate starting at rest slides down a rough 4.3 m long ramp, inclined at 20.3 degrees with the horizontal. 17 J of energy is lost to friction. What will be the speed of the crate at the bottom of the incline

It should be d if not then c

It is either a  proton or a neutron im almost positive. hope this .

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

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.