I need help with a question which is what is the density of the object 4g to 2cm3.

0.19 m/s and 0.45 m/s

the components of a vector are the parts of the vectors that are to each other.

b perpendicular

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.