In 1996, Michael Johnson ran 200.0 m in 19.32 s. Johnson's mass at the time of his record-breaking run was about 77 kg. What was his momentum at his
average speed?

Work Shown:

velocity = (change in distance)/(change in time)

velocity = (200.0 meters)/(19.32 seconds)

velocity = (200.0/19.32) meters per second

velocity = 10.351966873706 meters per second

velocity = 10.35 m/s  after rounding to 4 sig figs

Momentum = (mass)*(velocity)

Momentum = (77 kg)*(10.35 m/s)

Momentum = (77*103.5) kg m/s

Momentum = 796.95 kg m/s

Edit: Corrected from 2000.0 to 200.0

d) physical means can be used to separate the components of air.

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.