Final answer:
Wheel A increases its speed from rest at a constant rate, as this describes uniform acceleration similar to a merry-go-round gaining constant rotational speed.
Step-by-step explanation:
The provided question involves Wheel A increasing its speed from rest. This situation can reference different types of acceleration, but according to the principles of physics, if this increase is uniform or steady, the correct choice would be a constant rate. This concept is analogous to the example where a merry-go-round increases from rest to a constant rotational speed. Acceleration can be defined in physics as a change in velocity, and this can occur in three ways: speeding up, slowing down, or changing direction, as outlined in the 'Check Your Understanding' segment.
An example of a situation involving constant angular acceleration is described in question 42, which addresses a wheel rotating with a constant angular acceleration. Given that Wheel A starts from rest and accelerates uniformly, it does so at a constant rate of angular acceleration, similar to the wheel in question 42 with a constant angular acceleration of 5.0 rad/s².