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(1) How far does the cab move while accelerating to full speed from rest?

v = 261m/min

= 261m/min * (1/60)min/s

= 261/60 m/s

= 4.35m/s

a = 1.21m/s^2

a) u = 0

v^2 = u^2 + 2ad

so

v^2 = 2ad

d = v^2 /2a ≈ 7.8192m

(2) How long does it take to make the nonstop 185 m run, starting and ending at rest?

so d = 2*7.8192 = 15.6384m all together

d = (1/2)a(t1)^2

so

t1 = √(2d/a) ≈ 5.08414s

spends D = 185 - 15.6384 = 169.3616m at constant velocity v=4.35m/s

D = vt2

so

t2 = D/v ≈ 38.9337s

therefore

T = 5.08414 + 38.9337 = 44.01784s all up

The issue i'am having is with question 2. From some reason 44.01784 isn't right, what am i doing wrong. i know my first answer is correct