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dik = n = 50x
t = 10 s
dit = f ? , T ?
jwb= f = n:t = 50 : 10 = 5hz
jwb= T= t:n = 10 : 50 = 0,2s
no 22
dik = t = 0,2s
v = 1500m/s
dit = s ?
jwb = s = v.t :2
= 1500.0,2 : 2
= 300 : 2
= 150 m