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Displacement in Conversation of Energy on Incline vs Projectile

  1. Nov 15, 2014 #1
    How come when I do a conservation of energy up an incline the displacement is the distance up the incline, but when I do a conservation of energy from a projectile the displacement is not the resultant of the x and y displacements (instead, it's only the displacement in the y-direction)?

    Thank-you
     
  2. jcsd
  3. Nov 15, 2014 #2

    A.T.

    User Avatar
    Science Advisor

    If the forces are only along y, then only y-displacement matters for work done. Look up the definition of work and of the dot product involved in it.
     
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