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: Easy problem, but no idea how to solve it?

  1. Jan 22, 2009 #1
    1. The problem statement, all variables and given/known data
    A motorbike with the velocity 40km/h is able to stop at a distance, D, when it brakes with maximal deacceleration. At what distance will a car with a velocity of 60 km/h stop?


    2. Relevant equations


    .
    3. The attempt at a solution
    I was trying to solve it through regular equations such as at^2=distance, but there seems to be too many unknowns. Any ideas?
     
  2. jcsd
  3. Jan 22, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Use v^2 - u^2 = 2as. Find a in terms of D. Here u = 40 km/hr and v = 0. Use this a and find the distance for 60 km/hr using the above equation.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook