Think back to the "Skate Park" Lab and how the skater rolled back and forth on the ramp when there was no friction. After he rolled up and down the ramp a few times,

how did the potential energy compare to the total energy at the bottom of the

ramp? Make sure you explain in your response whether energy is conserved or not in

the system. Make a claim answering the question, give evidence to support your

a

claim, and provide reasoning for your evidence supporting the claim.

multiple

ill do it for 100, also this isnt 80 its 40

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.