) Which two types of information does the video provide that were not available in Tyson’s essay?

an illustration of colliding black holes

an x-ray image of objects entering a black hole

a simulation showing the power of a black hole

a label showing the speed of black holes

an animation showing the movement of a black hole

a simulation showing the power of a black hole

an animation show the movement of a black hole

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s