Question

object is falling freely from a tower it travels distance =1/2 the height of the tower in its last second of journey​

Answer 1

Answer:

Explanation:

Time of flight =  

g

2H

​  

 

​  

s

Distance traveled in last second =H-distance traveled in =(  

g

2H

​  

 

​  

−1)s

Distance traveld in (  

g

2H

​  

 

​  

−1)s=  

2

1

​  

g(  

g

2H

​  

 

​  

−1)  

2

 

=  

2

g

​  

[  

g

2H

​  

+1−2  

g

2H

​  

 

​  

]

=H+  

2

g

​  

−g  

g

2H

​  

 

​  

 

=H+  

2

g

​  

−g  

2H

​  

g

15=H−(H+  

2

g

​  

−  

2gH

​  

 

=  

2gH

​  

−  

2

g

​  

=  

2gH

​  

−5

2gH

​  

=20

2×10×H=400

H=20m