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Math Help - Physics help EMERGENCY!

  1. #1
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    Physics help EMERGENCY!

    I need help with a couple of problems. I really need this soon so any help will really be of service.


    Two particles are at the same point at the same time, moving in the same direction. Particle A has an initial velocity of 8.6 m/s and an acceleration of 3 m/s^2. Particle B has an initial velocity of 2.5 m/s and an acceleration of 5.8 m/s^2.
    At what time will B pass A?


    And:

    A subway train starting from rest leaves a station with a constant acceleration. At the end of 6.58 s, it is moving at 16.45 m/s.
    What is the train's displacement in the first 4.42834 s of motion?


    Thank you sooooooo much!
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  2. #2
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    Two particles are at the same point at the same time, moving in the same direction. Particle A has an initial velocity of 8.6 m/s and an acceleration of 3 m/s^2. Particle B has an initial velocity of 2.5 m/s and an acceleration of 5.8 m/s^2.
    At what time will B pass A?
    both particles will have the same displacement when B passes A.

    here is the displacement equation ...

    \Delta x = v_0 t + \frac{1}{2}at^2


    A subway train starting from rest leaves a station with a constant acceleration. At the end of 6.58 s, it is moving at 16.45 m/s.
    What is the train's displacement in the first 4.42834 s of motion?
    a = \frac{\Delta v}{\Delta t}

    once you calculate acceleration, then you can use

    \Delta x = v_0 t + \frac{1}{2}at^2

    to calculate the displacement.
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by bandnerd1892 View Post


    Two particles are at the same point at the same time, moving in the same direction. Particle A has an initial velocity of 8.6 m/s and an acceleration of 3 m/s^2. Particle B has an initial velocity of 2.5 m/s and an acceleration of 5.8 m/s^2.
    At what time will B pass A?
    We need to know their initial seperation. Then it is a relative velocity problem. The initial relative velocity is 8.6-2.5 m/s and the relative acceleration is 3.0-5.8 m/s^2

    RonL
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