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September 18, 2014

September 18, 2014

Posted by **Casey** on Saturday, June 18, 2011 at 4:39pm.

My work: I started by solving Ug=mgh

(19.7kg)(9.8)(2570) = 20073224.2

Initial Kinetic + 1/2mgv^2

Ug + ki = Ei

final e = 1/2mgv^2f

change in E = Ei-Ef

The problem I am having is with the simple calculations. When I plug in my mass in kg and velocity in m/s.. I am not getting the correct answer in Joules.. Is there some type of conversion that I am missing?

- Physics -
**bobpursley**, Saturday, June 18, 2011 at 5:10pmI do not understand your work.

HE started with Kinetic energy and potentail energy. He ended with some kinetic energy.

change= intial energy-final energy

= 1/2 m Vi^2 + mg*h -1/2 m vf^2

where Vi=112000/3600 m/s

Vf= 5.21m/s

m=79.7kg

I have no idea what conversions you might have done.

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