A15,000-kg train car moving due east at 23 m/s collides with and couples to a 10,000-kg train car that is initially at rest. find the common velocity of the two-car train after the collision. (east is defined as positive. indicate the direction with the sign of your answer.)

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.