.If a current of 5 Amperes flows through the conductor. The number of electrons per second will be: 1. 7.68 x 1020
2. 1.6 x 10-19
3. 3.12 x1019
4. 4 x 1019

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.