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Jawaban:

Soal 1. (C) 20 rad/s

Soal 2. (A) 10 Hz

Penjelasan:

Soal 1

k = 20 N/m

m = 50 gram = 5×10^-2 kg

kecepatan sudut = w

k = m w^2

w^2 = 20 / 5×10^-2

w = √400

w = 20 rad/s

Soal 2

y = A sin w.t

y = 0,05 sin 20π.t

Didapat w = 20π

f = ?

w = 2π / T

T = 2π / w

= 2π / 20π

= 0,1 s

f = 1/T

= 1/0,1

= 10 Hz