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From the top of a tower, a stone is thrown up. It reaches the ground in time \( t_{1} \).A second stone thrown down with the same speed reaches the ground in time \( t_{2} \). A third stone released from rest reaches the ground in time \( t_{3} \). Then:
(a) \( t_{3}=\frac{t_{1}+t_{2}}{2} \)
(b) \( t_{3}=\sqrt{t_{1} t_{2}} \)
(c) \( \frac{1}{t_{3}}=\frac{1}{t_{1}}-\frac{1}{t_{2}} \)
(d) \( t_{3}^{2}=t_{1}^{2}-t_{2}^{2} \)
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