I need help with this one I have been working on this for afew hours and just ca

Question

I need help with this one I have been working on this for afew hours and just can't get it.
A partical (charge= +2.0mC) moving in a region where onlyelectric forces act on it has a kenetic energy of 5.0J at point A.The partical subsequently passes through point B which has anelectric potential of +1.5kV relative to point A. Determine thekenetic energy of the partical as it moves through point B. I need help with this one I have been working on this for afew hours and just can't get it.
A partical (charge= +2.0mC) moving in a region where onlyelectric forces act on it has a kenetic energy of 5.0J at point A.The partical subsequently passes through point B which has anelectric potential of +1.5kV relative to point A. Determine thekenetic energy of the partical as it moves through point B.

Explanation / Answer

According to conservation of energy    K1 + U1 = K2 + U2    5.0 J + 0 = K2 + eV     K2 = 5.0J - eV           = 5.0J- ( 2 x 10-3C* 1.5 x 103V )             =2.0J        

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