The magnitude of the electric field due to a disk of radius 3 m and a uniformly distributed positive charge is measured to be 150 N/C at a location in the air 6 mm from the center of the disk, along a line perpendicular to the disk. Approximately what is the magnitude of the electric field due to the disk at a location 9 mm from the center of the disk, on the same line?

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.