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A stone dropped from a building of heigh...

A stone dropped from a building of height `h` and it reaches after `t` second on the earth. From the same building if two stones are thrown (one upwards and other downwards) with the same speed and they reach the earth surface after `t_(1)` and `t_(2)` seconds, respectively, then

A

`t=t_(1)-t_(2)`

B

`t=(t_(1)+l_(2))/(2)`

C

`t=sqrt(t_(1)t_(2))`

D

`t=t_(1)^(2)t_(2)^(2)`

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