Answer:
Motorcycle travel 39.75 m while coming to a stop
Step-by-step explanation:
We have equation of motion
 v = u + at
 Final velocity, v = 0 m/s, u = 15 m/s, t = 5.3 s
 0 = 15 + a x 5.3
 a = -2.83 m/s²
 Now we have the other equation of motion
 v² = u² + 2as
 0² = 15² - 2 x 2.83 x s
 s = 39.75 m
 Motorcycle travel 39.75 m while coming to a stop