Hi Albert, I have three questions to you: (1) If I have to step up 1 meterheight

Question

Hi Albert,

I have three questions to you: (1) If I have to step up 1 meterheight, then my PE = mgh, but
                                                if I must step down from 1 m height, then still I have the PE =mgh???
(2) If a wrestler pushes an opponent approximately0.5 m, then I should use the formula KE = 1/2 mv2?
(3) We know that Energy = Fxdistance. The question is when should we usethis formula? Because what I know I never use it. Ialwys use the aforementioned two formulas.
Thank you,

Emeric
I will live for my house Friday, then as I mentioned to you no morequestions. Please can you send me your answer untilWednesday?

Explanation / Answer

(1) PE = -mgh because gravity is doing work (2) , work =Force*distance =Mass*acceleration*.5m for KE, you may use 1/2mv^2 if you know thevelocity (3) Energy does not = Fx , work = Fx (which is in Nm (Newtonmeters)) the NET Work= KE remember also that KE=PE , ENERGY ISCONSERVED! PE = mgh KE = 1/2mv^2 Total E = KE + PE Any other questions, please ask:)

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