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h = 10 m
ditanyakan :
v = ?
t = ?
jawab :
E awal = E akhir
m g h = 1/2 m v
v =√2gh
v = √2x10x10
v = √200 = 10√2 m/s
t = √2h/g
t= √2x10/10
t = √2 s