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Q. An athlete executing a long jump leaves the ground at a 30° angle and travels 7.8 m. What was the take-off speed? If this speed were increased by just 5.0%, how much longer would the jump be?

Q. What must the charge (sign and magnitude) of a particle of mass 1.44 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.

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