Please help, test tomorrow!?

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IO1232

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A wheel of moment of inertia of 5.00 kgxm2 starts from rest and accelerates under a constant torque of 3.00 Nxm for 8.00 s. What is the wheel's rotational kinetic energy at the end of 8.00 s?
a.57.6 J
b.64.0 J
c.78.8 J
d.122 J
 
T = Ia = I w / t, w = Tt / I = 3(8)/5 = 4.8 radians/s

E = 0.5 I w^2 = 0.5(5)(4.8)^2 = 57.6 J

note: T => torque
I => moment of inertia
a => angular acceleration
w => angular velocity
t => time
E => kinetic energy
 
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