A car is traveling to the left, which is the negative direction. The direction of travel remains the same throughout this problem. The car's initial speed is 25.6 m/s, and during a 8.48-second interval, it changes to a final speed of (a)31.2 m/s and (b)10.8 m/s. In each case, find the acceleration (magnitude and algebraic sign).

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?