A turntable is spinning with an initial angular speed of 5.0 rad s⁻¹. Its angular acceleration is 2.0 rad s⁻² in the same direction. What will be its angular speed after it has turned through 8.0 rad?
a) 21rads−1
b) 5.1rads−1
c) 7.6rads−1
d) 6.4rads−1