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November 10th, 2016, 01:46 PM  #1 
Newbie Joined: Aug 2015 From: Alberta Posts: 18 Thanks: 0  Kinetic Energy
I'm having trouble with calculating Kinetic Energy. River water with a mass of 100 tonnes is moving at 12.5km/h. What is its kinetic energy? E = 1/2mkw I got 100000 x 3.47 X .5 = 1735000 j But the real answer is suppose to be 602.7 kj. I don't get it. 
November 10th, 2016, 02:11 PM  #2  
Senior Member Joined: Sep 2015 From: USA Posts: 1,788 Thanks: 921  Quote:
$12.5 km/hr = 3.472 m/s$ $100 tonne = 100000 kg$ $E = \dfrac 1 2 (100000)(3.472)^2 = 602816.36 J = 602.8 kJ$ Last edited by romsek; November 10th, 2016 at 02:15 PM.  
November 15th, 2016, 04:39 AM  #3  
Math Team Joined: Jan 2015 From: Alabama Posts: 2,966 Thanks: 807  Quote:
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energy, kinetic 
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