A flywheel is spinning at 30 rad s⁻¹. It is first accelerated at 5 rad s⁻² for 4 s and then immediately decelerated at 4 rad s⁻² until it stops. Determine the total time elapsed from the start of acceleration to the moment it comes to rest.
a) 14.5s
b) 16.5s
c) 11.5s
d) 20.5s