Modern oil tankers weigh over a half-million tons and have lengths of up to a quarter of a mile.?

Modern oil tankers weigh over a half-million tons and have lengths of up to a quarter of a mile. Such massive ships require a distance of 5.0 km (about 3.0 mi) and a time of 20 min to come to a stop from a top speed of 30 km/h.
(a) What is the magnitude of such a ship’s average acceleration in m/s2 in coming to a stop?
(b) What is the magnitude of the ship’s average velocity in m/s?

s = 5000 m
t = 1200 s
u = 30000 m/ h = 8.33333333 m/s
v = 0 m/s

v = u + at
v^2 = u^2 + 2as

s = ut + 0.5 at^2

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