Longitudinal, because the sound can only travel at one direction
A is right because I took the test
. . . 'protect' its domestic steel industry, by
increasing the price of imported steel.
<span>At the exact instant the blue ball reaches maximum height, it is stationary for that millisecond in time before it begins to fall, therefore its speed is zero. (The other factors listed have no effect on the speed at the moment of maximum height.)</span>
