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Vt^2 = Vo^2 + 2as
20^2 = 50^2 + 140a
400 = 2500 + 140a
- 2100 = 140a
a = -15 m/s^2
Kejadian II
Vt^2 = Vo^2 + 2as
0 = 20^2 - 30s
30s = 400
s = 40/3 m