Physics man 4?

Question

4. At highway speeds, a particular automobile is capable of an acceleration of about 1.6 m/s^2. At this rate, how long does it take to accelerate from 80 km/h to 110 km/h?

Answer 1

18.75 secs.

Answer 2

a = ∆v / ∆t

∆t = ∆v / a

= (31 m/s - 22 m/s) / 1.6 m/s²

= 5.6 s