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Suppose a 0.250 kg ball is thrown at 13.0 m/s to a motionless person standing on...

Suppose a 0.250 kg ball is thrown at 13.0 m/s to a motionless person standing on ice who catches it with an outstretched arm as shown in Figure 9.31.


Figure 9.31.

(a) Calculate the final linear velocity of the person, given his mass is 76.0 kg: This is the answer: .043 m/s (I know this).  

(b) What is his angular velocity if each arm has a 5.00 kg mass? You may treat his arms as uniform rods of length 0.9 m and the rest of his body as a uniform cylinder of radius 0.170 m. Neglect the effect of the ball on his rotational inertia and on his center of mass, so that it remains in his geometrical center. (I dont know how to get this)  

(c) Compare the initial and final total kinetic energy. (initial energy / final energy)

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