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dik : d1 = 5 cm →5×10^-2 m
d2 = 2cm → 2× 10^ -2 m
v1= 4 m/s
dit : v2=.. ?
v1/v2 = d2^2 / d1^2
4/v2 = (2×10^-2)^2 / (5×10^-2)^2
4/ v2 = 4/25
v2 = 25