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?

a. 13.6 m/sec

b. 1.39 m/sec

c. 185 m/sec

d. 9.80 m/sec

Answer 1

option A

Step-by-step 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 = (1)/(2) m v^2`

`v = √(2gh)`

`v = √(2* 9.8 * 9.44)`

`v = √(185.024)`

v = 13.60 m/s

Hence, the correct answer is option A