A box was lifted 4.3m exerted a force of 42N. how much work was done?

Which two particles are found in the center of an atom

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

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.