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: Very easy mechanics problem - am i making a stupid mistake?

  1. Oct 3, 2005 #1
    An object starts at time t = 0 with a velocity of v0 = +50 m/s and undergoes a constant acceleration of a = -11 m/s^2.

    b) How far from its starting (t = 0) position is the object at time t_1?

    I get 44.5 meters. it sounds right 'cuz the equation would mean 0+50*1 - 11/2 *1^2 = 44.5 meters. But the computerized grading system still counts it as wrong. Am I making a stupid mistake or what?

    thanks
     
  2. jcsd
  3. Oct 3, 2005 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Your answer looks OK to me. (Assuming it's straightline motion and you mean t = 1 s.) Does the system care about significant figures?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook