An unstretched spring has a force constant of 1200 N/m. How much work is required to stretch the spring by 1 m from Its unstretched length? 300 )
600)
1200)
1800)

b. latent learning (the word "latent" itself means something that exists but isn't obvious, only under certain conditions! )

f=ma newton's second law 7x8=56n

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!