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session.masteringphysics.com/myct/itemView?assignmentProblemID-85059920 Phy221 Homework9 PhET Tutorial: Energy Skate Park: Basics PhET Tutorial: Energy Skate Park: Basics Learning Goal: To understand conservation of mechanical energy involving gravitational potential energy and kinetic energy For this problem, use the PhET simulation Energy Skate Park Basics. This simulation allows you to explore the motion and energetics of a skat Start the simulation. When you click the simulation link, a new window will load. Click on Intro to get started. Enorgy Skale Park: Basics You can click and drag the skater to any location and release the skater from rest Watch the skater skate up Click on Bar Graph to see the relative magnitudes of the kinetic, potential,thermal, and total energies as a function of the skater's position Try and down the track information as a pie chart Play around with the simulation When you are done, click on the Reset button before answering the questions Part A Click on Bar Graph, and observe the kinetic energy bar as the skater goes back and forth. You can select Siow Motion below the track for a 10 Problem 10.39 10 pts

Explanation / Answer

Change in KE = Change in PE

1/2 * m* v2 = mgh

=> v = sqrt(2gh)

= sqrt(2*9.8*7)

= 11 m/s

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