1. Moment of inertia with hands stretched = 5.43+1.25*2*0.759*0.759

Moment of inertia when hand not stretched = 5.43

Now since momentum is conserved,

angular velocity = 20*(5.43+1.25*2*0.759*0.759)/5.43 =25.30 rad/s

Hence correct option is (c)

2. No work done

correct option is (c) equal to zero

your answer for Q2 is wrong

I am really sorry........the correct answer should be option (a) greater than zero

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