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: Need some quick help on a physics question

  1. Jan 20, 2005 #1
    If the mass slides down the inclined plane fomr the top, what will the speed be when it reaches the bottom

    so my equation is KE=1/2mv^2

    so 281 J = 1/2 (5) v^2

    Im blanking out on how to cancel out the square aaah thx

    EDIT : I GOT IT THanks
    Last edited: Jan 20, 2005
  2. jcsd
  3. Jan 21, 2005 #2


    User Avatar
    Science Advisor

    You've done the physics, don't let the arithmetic stop you now!
    To "cancel" an operation, use the opposite operation. What is the opposite of squaring?

    Try using a square root!

    If (5/2)v2= 281 then v2= 562/5. Take the square root of both sides.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook