A bus moves the first few meters of its journey with an acceleration of 5 m/s2 in 10s and the next few meters with an acceleration of 15 m/s2 in 20s. What is the final velocity in m/s if it starts from rest?

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A bus moves the first few meters of its journey with an acceleration of 5 m/s<sup>2</sup> in 10s and the next few meters with an acceleration of 15 m/s<sup>2</sup> in 20s. What is the final velocity in m/s if it starts from rest?