Kylee is running on the track. She starts off at the 200m line and runs to the 800 m line. She realizes she forgot her watch so she turns around and runs to the 450m line when she realizes it was in her pocket. What was her total displacement?

250m towards the starting point

Explanation:

 Displacement is the distance from start to finish with directional orientation of a body.

     Start                                         Finish

     200m           →                           800m

                                             ←

                                    450m

Her total displacement would be  = 450m  - 200m  = 250m

Displacement is therefore 250m towards the starting point

50 inches should be the resultant vector

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.