Question

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?

Answer 1

Answer: 796.95 kg m/s

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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

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Momentum = (mass)*(velocity)

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

Momentum = (77*103.5) kg m/s

Momentum = 796.95 kg m/s

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Edit: Corrected from 2000.0 to 200.0