Jake throws a rock downward from his deck at time t=0, which equals, 0 and it lands in his yard below. Which of the following graphs best shows the velocity v of the rock until it hits the ground?

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?