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waktu tempuh A-B (1,5λ) = 3 sekon, maka T = 2 sekon
maka cepat rambat
v = λ/t
v = 100 cm/ 2 s
v = 50 cm/s = 0,5 m/s
semoga membantu teman... :D
atau dengan cara lain
v = jarak / waktu
v = 150 cm / 3 sekon
v = 50 cm/ sekon
v = 50 cm/s = 0,5m / s
v = 100 cm/ 2 s
v = 50 cm/s = 0,5 m/s