Question

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

Answer 1

Answer:

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    

$m g h = \dfrac{1}{2} m v^2$  

     $v = \sqrt{2gh}$                  

     $v = \sqrt{2\times 9.8 \times 9.44}$

     $v = \sqrt{185.024}$              

            v = 13.60 m/s                      

Hence, the correct answer is option A