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August 28, 2014

August 28, 2014

Posted by **Mary** on Monday, December 7, 2009 at 5:59pm.

I used the eg=m*g*h equation and got a value of 1762081.16 .. i then used the ek=1/2mv^2 and got a value of 514227.195 .. for the total energy i added these 2 values and got a total of 6801507.671, is this correct?

3) A roller coaster car is at the top of a 53.8 m hill and has a mass of 1755.9. It is traveling at a velocity of 41.9. If the track is the only thing EXTERNAL to the system and the friction with the track removes 692.1 J of energy as lost energy, what is the system's TOTAL energy?

i used the eg=m*g*h and got a value of 925780.716 .. i then used the ek= 1/2mv^2 and got a value of 1541337.8 .. i added these together and got 2467118.516 and subtracted 692.1 to get a total energy of 2466426.416 .. is this the way to go about it and did i arrive at the right answer?

- science -
**bobpursley**, Monday, December 7, 2009 at 6:33pm1) no. How can you add 1.7 million + 514 thousand and get six million?

2) recheck math. I didn't get it.

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