Two charged spheres are a fixed distance apart. If the charge on each sphere is increased from 2C to 6C, the electrostatic force between the
spheres is
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Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)