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Q. Two very large charged parallel metal plates are 10.0 apart and produce a uniform electric field of 2.80×106 between them. A proton is fired perpendicular to these plates with an initial speed of 5.20 , starting at the middle of the negative plate and going toward the positive plate. How much work has the electric field done on this proton by the time it reaches the positive plate?

Q. In a head on collision, a car stops in .10 seconds from a speed of 14 meters per second. The driver has a mass of 70 kg, and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?

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