Question

A stone is dropped from a height 20m . Hoe much time will it take to reach the ground and waht will its velocity when it is just going to touch the ground . take acceleration 10m/s²​

Answer 1

Answer:

7 seconds if you will use your mind given by god

Answer 2

Answer:

Height, s=20m

Initial velocity, u=0

Acceleration due to gravity, g=10 m/s  

2

 

Final velocity, v=?

Time taken, t=?

(i) Using relation,

s=u t+  2

1

​  

gt  2

 

20=0×t+  2

1 ×10×t  

2

20=0+5t  

2t  2

=  5

20=4

t=  4

=2 s

(ii)For  a freely falling body:

v  2=u  

2+2gh=(0)  

2+2×(10)×(20)

So, v  

2  =400

v=  400

=20 m/s

The speed of stone when it hits the ground will be 20m/s.