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Question

A stone dropped from a building of height h and it reaches the ground after t seconds. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the ground after t1 and t2 seconds respectively, then

A
t=t1t2
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B
t=t1+t22
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C
t=t1t2
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D
t=t21t22
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Solution

The correct option is B t=t1t2


Step 1, Given data

Height of the building = h

Time taken to reach the ground = t

Two other balls are thrown in upward and downward directions simultaneously.

Step 2, Finding the relation
Taking downward as positive
For first case of dropping the stone, h=12gt2
For second case of downward throwing h=ut1+12gt21=12gt2

Or we can write
ut1=12g(t2t21)......(i)
For third case of throwing upwards h=ut2+12gt22=12gt2

Or we can write
ut2=12g(t22t2)....(ii)
On solving (i) and (ii) we get,
t1t2=t2t21t22t2

Or,
t=t1t2

Hence the relation is as given above.


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