1. Dismiss Notice
  2. Download free Tapatalk for iPhone or Tapatalk for Android for your phone and follow the SDN forums with push notifications.
    Dismiss Notice
Dismiss Notice
Visit Interview Feedback to view and submit interview information.

PS Question - Car overtaking truck

Discussion in 'MCAT Study Question Q&A' started by pacer, Sep 6, 2014.

  1. pacer

    2+ Year Member

    Joined:
    Aug 25, 2011
    Messages:
    92
    Likes Received:
    3
    Status:
    Pre-Medical
    A car accelerates at 6 m/s^2 starting from rest. At the same time, a truck travelling at 21 m/s passes the car. How long will it take for the car to overtake the truck?

    I am confused about how to set up the formulas for this type of question.
     
  2. Note: SDN Members do not see this ad.

  3. labqi

    5+ Year Member

    Joined:
    May 8, 2013
    Messages:
    124
    Likes Received:
    11
    Status:
    Pre-Medical
    I think you do it as follows
    Car d=vot + 0.5at2
    Truck d=vt

    Since they travel the same distance d is equal for both then
    vot + 0.5at2 = vt

    I am not sure but that's how I would approach. Please correct me if in wrong.


    Sent from my iPhone using Tapatalk
     
    BreakneckWalrus likes this.
  4. justadream

    7+ Year Member

    Joined:
    Apr 29, 2011
    Messages:
    2,173
    Likes Received:
    810
    Distance traveled by car = distance traveled by truck

    Distance traveled by car = .5 *a * t^2 = .5*6 * t^2 = 3t^2

    Distance traveled by truck = 21t

    3t^2 = 21t
    t = 21/3

    It will take 21/3 seconds.

    Plug back into either equation to find distance at this point.
    Distance = 21t = 21*(21/3) = 147
     

Share This Page