Answer:
![t=1.9 sec](https://tex.z-dn.net/?f=t%3D1.9%20sec)
Explanation:
From the question we are told that:
Height ![h=28m](https://tex.z-dn.net/?f=h%3D28m)
Time ![t=3s](https://tex.z-dn.net/?f=t%3D3s)
Generally the Newton's equation for Initial velocity upward is mathematically given by
![s=ut+\frtac{1}{2}at^2](https://tex.z-dn.net/?f=s%3Dut%2B%5Cfrtac%7B1%7D%7B2%7Dat%5E2)
![28=3u-\frac{1}{2}*9.8*3^2](https://tex.z-dn.net/?f=28%3D3u-%5Cfrac%7B1%7D%7B2%7D%2A9.8%2A3%5E2)
![u=24.03m/s](https://tex.z-dn.net/?f=u%3D24.03m%2Fs)
Generally the velocity at elevation and depression occurs as ball arrives and passes through S=28
![v=\sqrt{24.03-2*9.8*28}](https://tex.z-dn.net/?f=v%3D%5Csqrt%7B24.03-2%2A9.8%2A28%7D)
![v=5.35m/s and -5.35m/s](https://tex.z-dn.net/?f=v%3D5.35m%2Fs%20and%20-5.35m%2Fs)
Generally the Newton's equation for time to reach initial velocity is mathematically given by
![v=u+at](https://tex.z-dn.net/?f=v%3Du%2Bat)
![5.35=24.03-9.8t](https://tex.z-dn.net/?f=5.35%3D24.03-9.8t)
![t=\frac{28.03-5.35}{9.8}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B28.03-5.35%7D%7B9.8%7D)
![t=1.9 sec](https://tex.z-dn.net/?f=t%3D1.9%20sec)
Permafrost is a thick subsurface layer of soil that remains frozen throughout the year, occurring chiefly in polar regions.
I believe it would be D.
The main cause of weather is uneven heating of the earth's surface.
There are various factors that contribute to weather, however the main factor is the uneven heating of the earths surface. This creates temperature differences and can cause water to evaporate and condense. This, combined with earth's spin lead to large scale weather systems and wind currents. These in turn are influenced by land forms, bodies of water, and even vegetation.
Answer:
Basketball
Explanation:
Basketball was invented to keep athletes warm in the winter.
The answer to that is mechanical waves