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Q. A 50-gram super ball traveling at 25m/s is bounced off a brick wall and rebounds at 22 m/s. A high speed camera records this event. If the ball is in contact with the wall for 3.5 ms, what is the average acceleration of the ball during this time interval?

Q. Two small insulating spheres with radius 5.00×10-2 m are separated by a large center-to-center distance of 0.450 m. One sphere is negatively charged, with net charge -1.85 nanoCoulombs , and the other sphere is positively charged, with net charge 3.15 nanocoulombs . The charge is uniformly distributed within the volume of each sphere.

What is the magnitude of the electric field midway between the spheres?

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