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=10+10^2/(2x10)
diket v0 = 10m/s
h= 10
g = 10m/s^
vt^ = v0^ + 2gh
vt^ = 10^ + 2.10.10 = 100+40
= 140
lalu masukan ke persamaan gjb
vt^ = 2gh
140 = 2.10h
h = 140/20 = 80 m