assalamualaikum hay guys help me ❤

2,25T = 2 s
T = 2 x 100/225 s
T = 2 x 4/9
T = 8/9 s = 0,89 s

Karena f = 1/T maka
f = 1 : 8/9
f = 9/8 Hz = 1,125 Hz

Jawab: C