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a car starts from rest and accelerates uniformly to reach a speed of 21 m/s in 7.0s. What was the speed of the object after 2.0 seconds?

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V = Vo + a*t.
21 = 0 + a*7, a = 3 m/s^2.

V = 0 + 3*2 = 6 m/s.

a car starts from rest and accelerates uniformly to reach a speed of 21 m/s in 7.0s. What was the speed of the object after 2.0 seconds?

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