Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: I need some help with some problems

  1. Oct 1, 2004 #1
    I can't seem to figure these problems if anyone can give me the concept and start me off that would be great.

    Thanks in advance

    Problem one: A car is traveling at a constant speed of 27 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration must it maintain so that the two cars meet for the first time at the next exit which is 1.8 km away?

    Problem two: A bus stop to pick up riders. A woman is running at a constant velocity of +5.0 m/s in an attempt to catch the bus When she is 11 m from the bus, it pulls away with a constant acceleration of +1.0 m/s^2. From this point, how much time does it take her to reach the bus if she keeps running with the same velocity?

    *edit* oh and let me show you what i did so far

    ok for problem one i drew a picture to visualize this and somehow came up with .405 m/s^2. I think what i did was found out the time it took to get to 1800 m with 27 m/s as its velocity and got seconds and after i did 27/66.7(which was the result from what i did previously)

    with problem two i did: x=Vot+1/2at^2

    and got 1.86 s which i know is wrong =(

    any help would be fine thanks
     
    Last edited: Oct 1, 2004
  2. jcsd
  3. Oct 1, 2004 #2

    Pyrrhus

    User Avatar
    Homework Helper

    Oh i replied to you in the other forum.
     
  4. Oct 2, 2004 #3

    Doc Al

    User Avatar

    Staff: Mentor

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook