A small aircraft accelerates uniformly in a straight line along a runway. A timer is started as the aircraft rolls forward. The velocity of the aircraft is 8.0 m/s at 2.0 s and 20 m/s at 6.0 s.
How long after the timer is started does the aircraft reach a velocity of 32 m/s?
10 s10\ \mathrm{s}10 s
11 s11\ \mathrm{s}11 s
8.0 s8.0\ \mathrm{s}8.0 s
4.0 s4.0\ \mathrm{s}4.0 s