Change 200km/hr into m/sec

200km/hr=55.55m/sec

Explanation:

200km/1hr×1000m/1km×1hr/3600sec=200,000/36000

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

answerscientific theory;