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For the Atwood machine depicted above, the mass of the pulley wheel is $50\text{ g}$ , $r= 25\text{ cm}$, $R=50\text{ cm}$, $m_1=125\text{ g}$ and $m_2=150\text{ g}$. The mass of the rope and frictional effects are negligible.

If the pulley wheel starts from rest, what is the angular momentum of the pulley wheel after $5.0\text{ s}$?

A

$2.14 \text{ kg} \cdot \text{m}^2/\text{s}$

B

$-2.14 \text{ kg} \cdot \text{m}^2/\text{s}$

C

$6.13 \text{ kg} \cdot \text{m}^2/\text{s}$

D

$-6.13 \text{ kg} \cdot \text{m}^2/\text{s}$

E

$8.20 \text{ kg} \cdot \text{m}^2/\text{s}$

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