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Q. What should the charge (sign and magnitude) of a particle of mass 1.47 be for it to remain stationary when placed in a downward-directed electric field of magnitude 610?

Utilize 9.81 for the magnitude of the acceleration because of gravity.

Q. A police car is travelling at a velocity of 19 m/s due north, when a car zooms by at a constant velocity of 41 m/s due north. After a reaction time of 0.900 s the policeman begins to pursue the speeder with an acceleration of 5.1 m/s2. Including reaction time, how long does it take for the police car to catch up with the speeder?

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