grace veronica sompie_xg_19

19. DIK: V0=30 m/s
Vt=0 m/s
s di jalanan yang kering= 73 m
s di jalanan yang basah=120 m
s di jalanan dipenuhi salju=600 m
DIT : a. perlambatan (a)
b. s pada masing-masing peristiwa bila V0=15 m/s
c. s total jika t=0,75 s dan V0=30 m/s
JWB : a. -kering:
Vt = Vo + a.t
0 = 30 + a.t
-30= a.t
t = -30/a
s = Vo.t + 1/2 a.t2
73 = 30.-30/a +1/2 a (-30/a)2
73 = -900/a+1/2a.900/a2
73 = -1/2.900/a
a = -6,16 m/s2

-basah:
Vt = Vo + a.t
0 = 30 + a.t
-30= a.t
t = -30/a
s = Vo.t + 1/2a.t2
120 = 30.-30/a +1/2 a (-30/a)2
120 = -900/a+1/2a. 900/a2
120 = -1/2.900/a
a = -3,75 m/s2
-salju:
Vt = Vo + a.t
0 = 30 + a.t
-30= a.t
t = -30/a
s = Vo.t + 1/2 a.t2
600 = 30. -30/a +1/2 a(-30/a)2
600 = -900/a+1/2a.900/a2
600 = -1/2.900/a
a = -0,75 m/s2


b. -kering:
Vt = Vo + a.t
0 = 15 + -900/146 .t
t = 1290/146 = 645/73
s = Vo.t + 1/2 a.t2
s = 15. 645/73 + 1/2 . -900/146.(645/73)2
s = -162,55 m

-basah:
Vt = Vo + a.t
0 = 15 + -900/240 .t
t = 2700/240 = 45/4
s = Vo.t + 1/2 a.t2
s = 15. 45/4 + 1/2 . -900/240.(45/4)2
s = -68,55 m

-salju:
Vt = Vo + a.t
0 = 15 + -3/4 .t
t = 57/4
s = Vo.t + 1/2 a.t2
s = 15. 57/4 + 1/2 . -3/4.(57/4)2
s = 137,6 m



c. -kering:
Vt = Vo + a.t
0 = 30 + a . 0,75
-30= 0,75a
a = 40
s = Vo.t + 1/2 a.t2
s = 30. 0,75+ 1/2 . 40(0,75)2
s = 33,75 m

-basah:
Vt = Vo + a.t
0 = 30 + a . 0,75
-30= 0,75a
a = 40
s = Vo.t + 1/2 a.t2
s = 30. 0,75+ 1/2 . 40(0,75)2
s = 33,75 m


-salju:
Vt = Vo + a.t
0 = 30 + a . 0,75
-30= 0,75a
a = 40
s = Vo.t + 1/2 a.t2
s = 30. 0,75+ 1/2 . 40(0,75)2
s = 33,75 m




Grace Veronica Sompie
X-G / 19