Aplayer passes a basketball to another player who catches it at the same level from which it was thrown. the initial speed of the ball is 7.1m/s and it travels a distance of 4.6m. what were (a) the initial direction of the ball and (b) it's time of flight?

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?

An object has a weight of 500 on earth what is the mass of this object

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?