21. The figure below shows a student before and after a bungee jump. The bungee cord has an unstretched length of 200 m.
After
Before
Student
Bridge
Bungee
cord
20.0 m
Extended
bungee
cord
55.0 m
Lowest point
Stationary
student
River
The mass of the student is 50.0 kg.
The gravitational field strength is 9.8 N/kg.
(a) Write down the equation which links gravitational field strength, gravitational
potential energy, height and mass.

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

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

3. dark matter

empty space could also be a simple vacuum