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physics(check my answer)

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can you tell me what i did wrong on this problem

Rigid rods of negligible mass lying along the y axis connect three particles. The system rotates about the x axis with an angular speed of 3.30 rad/s.

a)Find the total rotational kinetic energy evaluated from 1/2 I omega^2
b)Find the tangential speed of each 4kg and 3kg particles
4kg: 4x3.3=13.2m/s
3kg: 3x3.3=9.9m/s

c)Find the total kinetic energy evaluated from Σ mi vi2/2


i don't know why i got these wrong

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