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Q. A flea jumps straight up to a maximum height of 0.420 . What is its initial velocity as it leaves the ground? How long is the flea in the air from the time it jumps to the time it hits the ground?

Q. Two particles are fixed on an x axis. Particle 1 of charge q1=2.1x10-8 C at x=20.0 cm and particle 2 of charge q2= -4.0q1 at x=70 cm. At what coordinate (i.e., x value) on the axis is the net electric field produced by the particles equal to zero?

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