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Q. A flower pot falls from the roof and passes in front of a window of height h as it falls to the ground to smash to pieces. If the flower pot takes a time T to pass from top to bottom in front of window. Find the (as-yet-unknown) height H from the top of the window to the roof.

Q. What should the charge (sign and magnitude) of a particle of mass 1.45 g be for it to remain stationary while placed in a downward-directed electric field of magnitude 600 N/C?

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