When moving at highway speed, a Triumph America motorcycle is capable of accelerating at 2.1 m/s2. At this rate, how long does it take to accelerate from 103 km/h to 88 km/h?
That is a deceleration rate.
The velocity change is -15 km/h. Convert that to m/s and divide by the decleration rate to get the time required.
t = 1.98 s