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A car starts from rest, moving along a straight line, first with an acceleration a = 5m/s^2 starting from rest, then uniformly and finally decelerating at the same rate 5m/s^2, comes to rest. If the total time of motion of car is 25 s and average velocity during the time is equal to v = 20 m/s . How long does the particle move uniformly?​

Need step-by-step explanation. No spam. Thanks.

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fluffychimchim
Here’s my work to your question. If you need clarification feel free to drop something in the comment section.
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