zattyzatzat
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Size:  52.7 KBCan someone explain what the questions wants? This is my first time coming across a question like this. So far I found the horizontal displacement via cos(60) * 4 = 2. But am not sure what to do with it and how it relates to the multiple choice answers. Thanks!

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Ladkus
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Since this is a uniform electric field, and you have found the horizontal distance is travels (but needs to be converted in metres), you can multiply this by the electric field strength. The electric field lines go from left to right which implies the left is positively charged and the right is negatively charged. At X the electron has a lower potential than at Y, so since potential energy increases, kinetic energy decreases as conservation of energy law must be obeyed. This explains the minus sign.
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DrPhysicsWatford
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This is asking you to consider conservation of energy in an electric field.

Think about why the kinetic energy might change? What path has the electron taken between X and Y? And does it matter?
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