<em><u>Answer:</u></em>
zero acceleration
<em><u>Explanation:</u></em>
<u>Acceleration</u> is defined as the rate change of velocity with respect to time
<u>This means that:</u>

Now, since the velocity is given as a constant, this means that the value of the velocity does not change which means that the change of velocity is zero.
<u>Substitute in the formula:</u>

<u>Therefore,</u> for constant velocity, the acceleration is zero.
Hope this helps :)
Answer:

Explanation:
Given :
μ = 0
σ = 1
For 89th percentile
using invariant norm ( area, μ, σ )
= inv. norm ( 0.89, 0, 1 )
= 1.23
or
P ( x >
) = 0.89


Now using Normal table, Z = 1.23
Therefore, 

Secondary wave is the answer