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Q. A speed skater moving across frictionless ice at 8.30 m/s hits a 5.10 m wide patch of rough ice. She slows steadily, then continues on at 5.80 m/s. what is her acceleration on the rough ice?

Q. What must the charge (sign and magnitude) of a 1.43 g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 630?

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