turner’s treadmill starts with a velocity of
−2.7 m/s and speeds up at regular intervals
during a half-hour workout. after 33 min, the
treadmill has a velocity of −7.1 m/s.
what is the average acceleration of the
treadmill during this period?
answer in units of m/s

By definition, we have to:

Where,

vf: final speed

vo: initial speed

t: time

a: acceleration

Clearing the acceleration we have:

When replacing values we have to take into account two things:

1) Assume that the given speeds are positive

2) The time must be in seconds

The time in seconds is:

Then, replacing values we have:

The average acceleration of the treadmill during this period is:

a and c

explanation:

both a and c are correct answers to my knowledge, it's been a bit since i've done anything related to magnetic fields, but it should be right.

d) the number of neutrons plus the number of protons