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Physics 2 (URGENT)

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Which of the following has an acceleration in the same direction as the object's motion?

1. Vi=3.5m/s [east]; Vf=7.5m/s [east]
2. Vi=45km/h [north]; Vf=60km/h [north]
3. Vi=15m/s [right]; Vf=10m/s [left]

Textbook Ans: 1 and 2

Can someone explain why? Cause I don't know how to get the answer. Thanks very much.

  • Physics 2 (URGENT) -

    If the speed is increasing in the direction the thing is going, that qualifies.
    Number 3 is reversing direction, moving right at the beginning but accelerating left.

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