a stone is dropped off a cliff, the stone hits the floor at a speed of 21.2 m/s the acceleration due to gravity on earth is 9.8 m/s²

Answer is in the photo. I can only upload it to a file hosting service. link below! Good Luck!

https://cutt.ly/wzdvC7R

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer