A sound wave travels in air toward the surface of a freshwater lake and enters into the water. The frequency of the sound does n
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Answer:
<em>12 m/s</em>
Explanation:
<u>Projectile Motion</u>
It's also known as 2D motion because the movement takes place in both axis x and y. The x-axis motion is at a constant speed since in absence of friction, no external force stops or accelerates the object. The y-axis motion is at variable speed, which is changed by the acceleration of gravity that makes the object to reach a maximum height and then go back to ground level.
The maximum horizontal distance reached (also called Range) is given by
Knowing that , we solve for Vo
Thus, the initial speed of Mike Powell was 12 m/s