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Q. Two 3.5cm-diameter disks face each other, 2.0mm apart. They are charged to +-15nC. What is the electric field strength between the disks? Also, A proton is shot from the negative disk toward the positive disk. What launch speed must the proton have to just barely reach the positive disk?

Q. A net force of 25 N is applied for 5.7 s to a 12-kg box initially at rest. What is the speed of the box at the end of the 5.7-s interval?

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