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adnanchowdhury
Group Title
Kinetic Energy and Potential Energy question:
http://d.pr/i/vcK4
The gymnast descends from position B and regains contact with the trampoline when it
is in its unstretched position. At this position, her centre of mass is 3.2 m below its
position at B.
Calculate her kinetic energy at the instant she touches the unstretched trampoline
 2 years ago
 2 years ago
adnanchowdhury Group Title
Kinetic Energy and Potential Energy question: http://d.pr/i/vcK4 The gymnast descends from position B and regains contact with the trampoline when it is in its unstretched position. At this position, her centre of mass is 3.2 m below its position at B. Calculate her kinetic energy at the instant she touches the unstretched trampoline
 2 years ago
 2 years ago

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timo86m Group TitleBest ResponseYou've already chosen the best response.0
mass*4.2*9.8 I think
 2 years ago

adnanchowdhury Group TitleBest ResponseYou've already chosen the best response.0
nope. That's PE of when the person is at B.
 2 years ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
and i will be ke once the person reaches back
 2 years ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
dw:1337888965008:dw
 2 years ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
dw:1337889467795:dw
 2 years ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
dw:1337889552978:dw
 2 years ago

lalaly Group TitleBest ResponseYou've already chosen the best response.1
kinetic energy =3.2/4.2 *2264
 2 years ago

stormfire1 Group TitleBest ResponseYou've already chosen the best response.1
@lalaly: Wow...that's much more shorter than the stuff I was about to post but it's deadon.
 2 years ago

stormfire1 Group TitleBest ResponseYou've already chosen the best response.1
Well, almost :) (3.2/4.2)*2264
 2 years ago

stormfire1 Group TitleBest ResponseYou've already chosen the best response.1
At any rate, what lalaly did was calculate the total PE from point A to B given 4.2m, 55kg and g (mgh = 2264J). Her KE at point B will be equal to this. Once you know those two things, you should be able to see that (3.2/4.2)*2264J will be the amount of KE at the point where the girl just touches the unstretched trampoline.
 2 years ago
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