A Stone ‘A’ Is Dropped From The Top Of A Tower 20 M High Simultaneously Another Stone ‘B’ Is Thrown Up From The Bottom Of The Tower So That It Can Reach Just On The Top Of Tower. What Is The Distance Of The Stones From The Ground While They Pass Each Other.

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Question

A stone ‘A’ is dropped from the top of a tower 20 m high simultaneously another stone ‘B’ is thrown up from the bottom of the tower so that it can reach just on the top of tower. What is the distance of the stones from the ground while they pass each other.

Solution

Correct option is

15 m

 

Let ‘t’ be the time when they pass one another

From (1) and (2) we get

                   

Stone B can reach just on the top of tower.

We can calculate the velocity of stone B,

          

           

            

From eq (1) the required distance from the ground is

          

          = 15 m

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