Question

A stone falls down from top of wall in 1s to the ground what is the speed of the stone just before it touches the ground ?What is the average velocity of the stone

Answer 1

Answer:10m/s

Explanation:

Answer 2

Speed of stone just before it touches the ground = 10 m/s

Average velocity = 5 m/s

Explanation:

u = 0

v =  

t = 1

a = g = 10 m/s2

From the equations of motion, we get:  

v = u + at

= 0 + 10 * 1

= 10 m/s

v2-u2 = 2 as

100 - 0 = 2 * 10 * s

s = 100 / 20 = 5 m

Displacement = 5m

Average velocity = displacement / time = 5 / 1 = 5 m/s