Jawabanmu

2014-05-04T20:51:23+07:00
F =  \frac{n}{t}
  =  \frac{50}{2,5}
  = 20 hz

Afwan klo salah~
1 2 1
2014-05-04T20:51:50+07:00
N/t = 50/2,5= 20 hz
semoga bermanfaat
1 2 1