What happened to the test charge when brought near another positive charge, and how did you use this fact to score a goal only using positive charges? Explain for both the practice charge and more difficult levels.

Explanation:

As the like charges repel and opposite charges attract each other. When we bring the test positive charge near to the positive charge then it will move away. If one want to score a goal then he/she has to bring the positive charge behind the test charge, repulsion will cause the test charge to move away from the positive charge and it will go into the goal.

As far as difficult levels are concerned you should put the positive charges outside the path which you want your test charge to take. Hope you understand it.

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.