(2) ION 8
A ball is projected vertically upwards with a speed of 10 m-s-t from point A,
which is at the top edge of a building. The ball hits the ground after 3 s. It is
in contact with the ground for 0,2 s and then bounces vertically upwards,
reaching a maximum height of 8 m at point B. See the diagram below. Ignore
the effects of friction.
8.1 Why is the ball considered to be in free fall during its motion?
B
8.2 Calculate the:
8.2.1 Height of the building
8 m
8.2.2 Speed with which the ball hits the ground
8.2.3 Speed with which the ball leaves the ground
-ground
aw a velocity versus time graph for the complete motion of the ball from A to B.
ow the following on the graph:
(3
(2

In the future, people will only enjoy one sport: electrodisc. in this sport, you gain points when you cause metallic discs hovering on a field to exchange charge. you are an electrodisc player playing the popular four disc variant. the disks have charges of qa = −8.0 µc, qb = −2.0 µc, qc = +5.0 µc, and qd = +12.0 µc. (1) you bring two disks together and then separate them. you measure the resulting charge of these two disks and find that it is +5.0 µc per disk. which two disks did you bring together? (a) a and b (b) a and c (c)a and d (d)b and c(e) b and d (f) c and d. (2) you bring three disks together and then separate them. you measure the resulting charge of these three disks and find that it is +3.0 µc per disk. which three disks did you bring together? a, b, and c (a) a, b, and d (c) a, c, and d (d) b, c, and d. (3) given the resulting charge of each disk measured in (b) is +3.0 µc, how many electrons would you need to add to a disk of this charge to electrically neutralize it? electrons