1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Basic motion question involoving kinematics

  1. Oct 31, 2012 #1
    Hey everyone,

    I have a question from a past exam paper that I was doing. I spent a lot of time trying to solve it, however I have failed.
    I would appreiciate it if I got some assistance from a professional or someone that can answer it correctly.


    A car is parked on the side of the road. The handbrake on the car partially fails causing it to roll backwards. The velocity of the car after it starts to move is 0.8 m/s.
    The owner of the car is standing 25m in front of the car when they see it start to roll backwards. He runs at a velocity of 7 m/s. towards it. How long will it take for him to first reach the front of the car?
  2. jcsd
  3. Oct 31, 2012 #2
    In T seconds, man travels 7*T m which is same as distance traveled by car (0.8T) and additional 25 m.
    D = 7T
    d = 0.8T
    D = 25 + d
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook