Can any one plz answer me this if you know any question just answer me plz

What will a positive and a negative charge do if they are separated from each other?

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.