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Math Help - Physics problem

  1. #1
    Senior Member Paze's Avatar
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    Physics problem

    Car A is still and starts driving as soon as car B drives past it with the speed 18m/s. Car A has acceleration 2,2m/s^2.

    How long does it take for car A to catch up with car B?


    This one is hitting me from the left field. I'm not close to solving it at all. Any help is appreciated. Please bear in mind that I am very new to physics when presenting a solution/directions. Thanks.
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  2. #2
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    Re: Physics problem

    let t=0 be the time B passes A.
    after a time t, B has traveled 18t meters and A has traveled 0.5(2.2)t2 (From the formula s= ut + 0.5at2)
    Thanks from Paze
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  3. #3
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    Re: Physics problem

    Another way to do this: set up everything "relative to B". Initially, the distance between A and B is 0 but A's speed, relative to B, is -18 m/s. At time t, A's distance from B is -18+ 1.1t^2.
    Thanks from topsquark and Paze
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  4. #4
    Senior Member Paze's Avatar
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    Re: Physics problem

    Thanks guys. Is 16,4 sec. the correct answer then?
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