Find the gravitational potential energy

  • Thread starter mustang
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  • #1
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Given: g=9.81 m/s^2.
A 41.7 kg child is in a swing that is attached to robes 2.16 m long. Find the gravitional potiental energy associated with the child relative to the child's lowest position under the following conditions:
B. when the ropes make a 34.7 degree angle with the vertical.

What equation would I use?
 

Answers and Replies

  • #2
HallsofIvy
Science Advisor
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Well, potential energy = mgh looks good!

You might also want to draw a picture and use a little trigonometry to determine exactly what h is when the swing makes an angle of 34.7 degrees with the vertical.
 

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