1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Physics question (kinetic energy) to all that apply

  1. Sep 15, 2004 #1
    Regarding what formula to use and how exactly is it modified to fit this problem:

    A 2.0KG coconut (initially at rest) falls from the top of a coconut tree 15 m high. What is the coconut's kinetic energy when it hits the ground? What is its speed?

    I went ahead and drew it out. I'm thinking I can use formulas for potential energy and kinetic. K=1/2 mv^2 and mg(z1-z2); still trying to figure out how to set it up,
    thanks for reading this,
    Last edited: Sep 15, 2004
  2. jcsd
  3. Sep 15, 2004 #2


    User Avatar
    Homework Helper

    Seems to me like it's a Conservation of Mechanical Energy problem,

    Kinetic Energy is always [In Classical Physics] 1/2*m*v^2
    Potential Energy here will be from gravity, mgh.

    It has two points you can use, when it starts (Vo =0) and when it hits the ground (h=0).
  4. Sep 15, 2004 #3
    Kinematics formulas will also work. You have initial velocity, acceleration, vertical distance, now find final velocity, then use that to find kinetic energy. Since this is probably in an Energy unit, though, you might want to stick to conservation of mechanical energy. Both methods work.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Physics question (kinetic energy) to all that apply