You are driving due north on i-81 to come to jmu with a speed of 10 m/s, suddenly you realize you forgot your book. you make a u-turn to go home, pick it up and now after 20s you are driving south with a speed of 20 m/s. what is your displacement after 20s?

first we make a U turn and travel towards home in t = 20 s

so the distance of home from initial position is

Now after picking up the book we travel back with speed 20 m/s

so again after t = 20 s the displacement is given as

so the net displacement is given as

so it will be displaced by total displacement 200 m

v=ir = 3x15 =45 v

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!