Answer:
The answer to your question is the second graph (the one attached).
Explanation:
We have to look for the graph that represents the data given.
a) The first graph is not correct because we look for a distance of 20 m, and this graph only goes from 0 to 10 m.
b) this graph is correct because it covers the distance (20 m) and the time (4 s)
c) This graph could be the right ooption but it is coming back and we look for a forward progress, then this graph is incorrect.
d) This graph shows that the dog is not moving, so this option is wrong.
Answer:
Speed = 0.296m/2
Period = 0.203 s
Explanation:
If by 'long' you mean the wavelength of the waves, then the wavelength .
The frequency of the waves is 14.8 waves every 3 seconds or
.
Now the relationship between wavelength , frequency
and speed
of the waves is:
We put in the values and
and get:
Now the period is just the inverse of the frequency, or