22.5 m
Step-by-step explanation:
Calculate initial velocity (u) when t = 0, and velocity when t = 3:
when t = 0, v = 2(0)² - 0 = 0 ⇒ u = 0
when t = 3, v = 2(3)² - 3 = 15 ⇒ v = 15
SUVAT:
s = su = 0v = 15a = t = 3
Substituting values into SUVAT formula: