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g=10m/s
a. agar h max maka Vt = 0
Vt²=Vo² - 2gh
0²=20² - 2(10)h
hmax= 400/20 = 20m
b. h=Vo t - 1/2 g t²
10 = 20t - 1/2 10 t²
5t²-20t+10=0
t²-4t+2=0
(pakai rms abc dpt t nya)
c. Vt = Vo -gt
Vt = 20 -10 . 1,5
Vt = 5m/s
h = Vo t - 1/2 g t²
h = 20 1,5 - 1/2 (10) 1,5²
h = 30 - 11,25
h = 18,75 m