Question

how does the angle becomes zero when an object is falling freely from some height​

Answer 1

Explanation:

this is the correct answer

Answer 2

From the figure, let the body fall from a height H from point A. the body strikes the point B which is h height above the ground. The path of the body after being stricken is parabolic. The time taken by the particle to fall from A to B is t1.

  (H−h)=21gt12

 t1=g2(H−h)

 The time taken by the body to fall from B to M is t2. 

  h=21gt22

 t2=g2h

Total tie during the journey is t

  t=t1+t2

 t=g2(H−h)+g2h

For maximum height, dhdt=0

After solving we get,

Hh=21