I believe it is Acoustics, the real name for it would be like Reverberation. But go with Acoustics. :)
Inelastic.
If it was elastic, they'd bump right off each other. But since they've been locked, or stuck together, this is inelastic.
A. Use the thin lens equation to determine the image distance from the lens. Is the correct answer because I have no idea why
True !! Hope I helped you out a bit!
Answer:
0.872<em>m/s</em>
Explanation:
Tangential velocity is given by the formula,

In the question given,
radius= 25meters
time= 180secs
pie= 3.14
number of laps= 1
The magnitude of tangential velocity equals;

<em>v </em>= 157<em>m</em>/180<em>secs</em>
Therefore, the magnitude of the tangential velocity
=0.872<em>m/secs</em>