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A car starts moving rectilinearly first ...

A car starts moving rectilinearly first with acceleration `alpha=5 m s^(-2)` (the initial velocity is equal to zero), then uniformly, and finally, deceleration at the same rate `alpha` comes to a stop. The time of motion equals `t=25 s`. The average velocity during this time is equal to `
72 kmh^(-1)` How long does the car move uniformly?

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