Asmall particle has charge -2.00 uc and mass 1.50×10-4 kg. it moves from point a, where the electric potential is v(a) = 200 v, to point b, where the electric potential v(b) = 920 v is greater than the potential at point a. the electric force is the only force acting on the particle. the particle has a speed of 4.30 m/s at point a.

1.)what is its speed at point b?
2.)and is it moving faster or slower at b than at a?

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.