tolong jawab nomor 2 dan 4 pakai cara!!

2) t = 4 m (diatas permukaan laut)
....d = 9 m (dibawah permukaan laut)


.............Y
a)..........^
............. |
..........4●.....●(4)........
..............|.......|........|....
..........3●......|.........|....
..............|....,..|.........|.....
..........2●......|.........|...
..............|.....,.|.........|.......
............1●......|.........|....
..............|.......|.........|......
..........0●......|.........|..................>X
..............|.................|..
......... -1●................|
..............|.................|.
.........-2●................|.
..............|.................|
.........-3●................|
..............|.................|
.........-4●................|
..............|.................|
.........-5●................|.
..............|.................|
.........-6●................|
..............|.................|
.........-7●................|.
..............|.................|
.........-8●................|
..............|.................|
.........-9●...............●(-9)
..............|.................

b) 4 - (-9) = 4 + 9 = 13

4) t = 2 m (diatas permukaan tanah)
....d = 3 m (dibawah tanah)

panjang tali
=2 - (-3)
= 2 + 3
= 5 m

Jadi panjang tali dari permukaan air ke katrol adalah 5 m