From the top of a builing , a ball is dropped, while another ball is projected horizontally at the same time, It is estimated that (i) two balls will strike the ground simultaneously, (ii) two balls will strike the ground with the same sped.
Read the above passage and answer the foolwing questions :
(i) Do you agree with the two statements ? ltbRgt (ii) How do you justify answer physically ?

Explanation

Two ball will strike the ground simultaneously. This is correct. But the second statement is wrong. In fact, the ball projected horizontally will hit the ground with a greater speed than the ball just dropped.
(ii) The first statement is correct because motions along horizontal and vertical directions are independent of each other with no interplay. In both the cases, vertical distance travelled is same, initial velocity along vertical is zero, and acceleration along vertical is same (=-g). Therefore, time taken to strike the ground is the same.
The second statement is wrong, because the body projected horizontally has been given some energy. Gravitational pull through the same height given same energy to both. Hence overall energy of body projected horizontally becomes more and hence it hits the ground with a greater speed than the ball just dropped.