Note: Choose a place to work where the air is cool and dry. Electric charges will dissipate into the air in humid conditions. Part A
Follow these steps to compare pleces of sticky tape that have the same charge:

• Tear off two pieces of clear sticky tape that are about 15 cm (6 inches) long. Stick the two pieces of tape side by side
on the tabletop.
• Tear off two more pieces of tape, and fold under a half inch of each piece as shown in the side view. This tab makes
them easy to pull off later on. Stick these pieces of tape onto the pieces already on the table and smooth them down.
top view
side view
tabletop
end of top
e folded
der
sticky side
of top tape
• Using both hands, grab the tabs of the two top pieces of tape. Carefully pull both top pleces of tape off the bottom
pleces. Turn the non-sticky sides of the tape toward each other.
What do you observe? If there's an interaction, explain whether the tape pleces attract or repel each other.

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.

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.