Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground?

a. 13.6 m/sec

b. 1.39 m/sec

c. 185 m/sec

d. 9.80 m/sec

option A

Explanation:

given,                                              

height of the drop of stone = 9.44 m

speed of the stone = ?                          

As the stone is dropped the energy of the stone will be conserved.

using conservation of energy.            

Potential energy = Kinetic energy    

            v = 13.60 m/s                      

Hence, the correct answer is option A

a sonic boom is a loud boom that breaks the sound barrier

explanation:

not too sure thinking all accelerations are pointed down