physics

An automobile starts from rest and accelerates to a final velocity in two stages along a straight road. Each stage occupies the same amount of time. In stage 1, the magnitude of the car's acceleration is 3.12 m/s2. The magnitude of the car's velocity at the end of stage 2 is 3.20 times greater than it is at the end of stage 1. Calculate the magnitude of the acceleration in stage 2.

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  1. let vf=velociyt end of stage1
    the velociyt at end of stage2 is 3.2vf

    Stage 1
    vf=3.12*time
    stage 2
    3.2vf=vf+a*time

    first equation: time=vf/3.12
    then 3.2Vf=vf+a*vf/3.12
    a= (3.2-1)3.12 check my math.

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