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= 240 / 1 menit
= 240 / 60 s
= 4 Hz
v = λ . f
λ = v / f
= 20 m/s / 4 Hz
= 5 m (b)
38). v = 2 . s / t
= 2 . 85 m / 0,5 s
= 340 m/s (b)
39). 1 / f = 1 / s + 1 / s'
1 / s' = 1 / f - 1 / s
= 1 / 15 - 1 / 20
= 4 / 60 - 3 / 60
1 / s' = 1 / 60
s' = 60 cm (c)