Question

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
...?

Answer 1

By definition, we have to:

`image`

Where,

vf: final speed

vo: initial speed

t: time

a: acceleration

Clearing the acceleration we have:

`image`

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:

`image`

Then, replacing values we have:

`image`

`image`

Answer:

The average acceleration of the treadmill during this period is:

`image`

Answer 2

33 60

---

1980 33*60sec = 1980 sec for comparison