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Q. A particle of mass 83 g and charge 89 C is released from rest when it is 89 cm from a second particle of charge -23 C. Determine the magnitude of the initial acceleration of the 83 g particle.

Q. A 4.20 x 10^2 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 x 10^4 J of work on the balloon in the process. At what height above the surface of the earth does the balloon have a speed of 7.30 m/s?

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