How fast was the vehicle moving when the timer began

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A vehicle is clocked for 2.5 seconds, and it is found that it accelerates at -3.89 m/s squared. Its also found that the vehicle was moving at 15.0 m/s [S] at the end of the timing. How fast was the vehicle moving when the timer began? (How can I do this with acceleration equals velocity over time formula OR acceleration equals final velocity minus initial velocity over time?)

Reference no: EM132512762

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