# A stone dropped from a balloon which is at a height ℎ, reaches the ground after 𝑡 second. From the same balloon, if two stones are thrown, one upwards and the other downwards, with the same velocity 𝑢 and they reach the ground after 𝑡1and 𝑡2 second respectively, then

Question : A stone dropped from a balloon which is at a height ℎ, reaches the ground after 𝑡 second. From the same balloon, if two stones are thrown, one upwards and the other downwards, with the same velocity 𝑢 and they reach the ground after 𝑡1and 𝑡2 second respectively, then

(A) $t=t_{1}-t_{2}$

(B) $t=\dfrac{t_{1}+t_{2}}{2}$

(C) $t=\dfrac{t_{1}+t_{2}}{2}$

(D) $t=\sqrt{t_{1}^{2}-t_{2}^{2}}$