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Q. What must the charge (sign and magnitude) of a particle of mass 1.48 be for it to remain stationary when placed in a downward-directed electric field of magnitude 630?

Use 9.81 for the magnitude of the acceleration due to gravity.

Q. A speeding car is traveling at 92 km/h toward a police car at rest. If the Police car begins accelerating when the speeding car is 250 meters behind the police car, what must the police car acceleration be for the police car to catch the speeding car?

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