A motorbike accelerates from 15 m/s to 25 m/s in 15 seconds. How far does the motorbike travel in this time? Give your answer to three significant figures.

Answer 1

v = Vi + a t
25 = 15 + a * 15
a = 10/15 = (2/3) m/s^2
d = Vi t + (1/2) a t^2
= 15 * 15 +(1/2)(2/3) * 15^2
= 30 + 75 = 105 meters

Answer 2

Yikes !
= 15 * 15 +(1/2)(2/3) * 15^2
= 225 + 75 = 300 meters

Answer 3

or just say average speed = (15 + 25) / 2 = 40/2 = 20 m/s
20 m/s * 15 s = 300 meters
I am getting kind of sleepy.