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Q. A 95- water skier floating in a lake is pulled from rest to a speed of 13 m/s in a distance of 27 m.

What is the net force exerted on the skier, assuming his acceleration is constant?

Q. What must the charge (sign and magnitude) of a particle of mass 1.47g be for it to remain stationary when placed in a downward-directed electric field of magnitude 660 N/C ?

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