An automobile of mass 2000kg started from rest position and increased it's speed uniformly to 9m/s in 30s,it maintained this speed for another 500s.calculate the inform acceleration of the automobile?

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9 m/s / 30 s = ? m/s^2
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An automobile of mass 2000kg started from the rest position and increased its speed uniformly to 9m/s in the 30s, it maintained this speed for another 500s.calculate the inform acceleration of the automobile.