Help me understand a physics numerical

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https://www.doubtnut.com/question-answer-physics/a-car-starting-from-rest-has-a-constant-acceleration-for-a-time-interval-t1-during-which-it-covers-a-232778782

in this numerical, s2 has value 1/2 a2t2 square

it seems like initial velocity is 0 for t2 path

but during retardation, its initial velocity should be same as final velocity of t1 segment

can you explain why initial velocity is 0?
Related categories: Engineering Mathematics Physics