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1.
v = 340 m/s
t = 2,5 s
Maka
S = v × t
S = 340 × 2,5
S = 850 m
Karena bolak balik, maka jarak anak ke tembok adalah S/2 = 425 m
2.
v = 1350 m/s
S = 3500 m
t ?
v = S/t
t = S/v
t = 3500/1350
t = 2,6 s