Question

An object is dropped from top of a tower and is allowed fall freely, what is its acceleration

and is it positive?​

Answer 1

Answer:

the answer in pictures

Explanation:

refer to the Attachment

Answer 2

Answer:

Let the stones meet at point A after time t.

For upper stone  :            

u  

′

=0          

x=0+  

2

1

​

gt  

2

 

x=  

2

1

​

×10×t  

2

           

⟹x=5t  

2

            ...(1)

For lower stone :            

u=25  m/s  

100−x=ut−  

2

1

​

gt  

2

 

100−x=(25)t−  

2

1

​

×10×t  

2

           

⟹100−x=25t−5t  

2

            ...(2)

Adding (1) and (2),  we get          

25t=100              

⟹t=4 s        

From (1),            

x=5×4  

2

                 

⟹x=80 m  

Hence the stone meet at a height of   20 m above the ground after 4 seconds.