Fisika no 2 gimana caranya tu

GJB

y = 78 m
g = 10 m/s²
t = __ ?

 y = ½ g t²
78 = ½ (10) t²
78 = 5 t²
  t = √(78/5) = 3,9497 ≈ 3,95 m  ←jawaban [e]

Ok ?