[o[2].[2] A parachute opens during the spacecraft’s descent through the atmosphere. Figure 2 shows the parachute—spacecraft system, with the open parachute displacing
the atmospheric gas. This causes the system to decelerate.
Figure 2
_--» displacement of gas

parachute — \
direction \
of travel \

/
. . ——~ spacecraft
displacement of gas
Explain, with reference to Newton's laws of motion, why displacing the atmospheric
gas causes a force on the system and why this force causes the system to
decelerate.
[4 marks]

which statement about this sum is true? −245+2.7

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )

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.