Question

a ball thrown up in vacuum returns after 12 seconds. Its position after 5 seconds will be the same as after ?​

Answer 1

Answer:

Due to Motion Symmetry

The motion of first 't' sec. = last 't' sec.

Therefore, the answer is 7sec

Answer 2

Answer:

Explanation:

●If it returns in 12 secs therefore, it takes 6 secs to go up and 6 secs to come down

(reason:- due to vacuum the acceleration due to gravity doesnt act on the ball)

●

__6 sec__ __6sec__

__5sec__ __7sec__ (therfore the position is same in 7thsec as that of 5 sec)

__4 sec__

__3 sec__

__2 sec__

__1 sec __

____________( lets say ball started frm here in vacuum)

:: 7sec is the answer!!!!!!