Hukum kekekalan momentum sudut.
L_awal = L_akhir
I₁. ω₁ = I₂.ω₂
I₁. ω₁ = (I₁ + m.r²).ω₂
1/2.M.r². ω₁ = ( 1/2.M.r² + m.r²).ω₂
1/2. 120. 2². 20 = ( 1/2. 120. 2² + 40. 2²). ω₂
4800 = ( 240 + 160 ). ω₂
ω₂ = 4800/400
ω₂ = 12 rad/s
Jawaban. B
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Hukum kekekalan momentum sudut.
L_awal = L_akhir
I₁. ω₁ = I₂.ω₂
I₁. ω₁ = (I₁ + m.r²).ω₂
1/2.M.r². ω₁ = ( 1/2.M.r² + m.r²).ω₂
1/2. 120. 2². 20 = ( 1/2. 120. 2² + 40. 2²). ω₂
4800 = ( 240 + 160 ). ω₂
ω₂ = 4800/400
ω₂ = 12 rad/s
Jawaban. B