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Q. A stone is thrown directly upward at 15.0 from ground level and feels no appreciable air resistance. Use the work-energy theorem to find how high it will be when its speed has been reduced to half of its initial value.

Q. Two particles are fixed to an x axis: particle 1 of charge q1 = +1.8e-8 C at x = 20 cm and particle 2 of charge q2 = -3.00q1 at x = 70 cm. At what coordinate on the axis is the net electric field produced by the particles equal to zero?

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