Consider point charges of +q and +4q, which are separated by 3.0 m. at what point, on a linebetween the two charges, would it be possible to place a charge of -q such that the electrostatic force acting on it would be zero?

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s.assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.