It's moving, in a straight line and at a constant speed. It can't be accelerating.
Portland, Oregon is a good city for biking because of all the biking lanes, also there is not that many cars driving, people are mostly walking.<span />
Force = 40 - 24 = 16N
Force = mass / acceleration
Acceleration = Force / mass
Acceleration = 16 / 8
Acceleration = 2 m/s^2
The correct answer is
<span>Density
In fact, the density of an object is the ratio between its mass m and its volume V:
</span>

<span>if the size of the object changes, its volume V changes as well, therefore the density d must change.</span>