A ball of mass 0.2kg is dropped from rest from the top of 45m tall building. What is the velocity of the ball?​

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

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

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.