Answer:
E. The wheel with spokes has about twice the KE.
See explanation in: https://quizlet.com/100717504/physics-8-mc-flash-cards/
C: Litmus Paper. Red litmus paper turns blue in acids; blue litmus paper turns red in bases
Which conditions I think you have place an incorrect image?
Explanation:
The particle will be at rest when its velocity
is equal to zero. Recall that the velocity is simply the derivative of the position
with respect to time:

Since 
then

Solving for t, we find that the particle will be at rest at

B)
The speed of the cart changed because it stopped.
Hope I could help!
-Marshy