A stone dropped from a building of height \[h\] and it reaches after \[t\] seconds on earth. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after \[{{t}_{1}}\] and \[{{t}_{2}}\] seconds respectively, then [CPMT 1997; UPSEAT 2002; KCET 2002]

• A.             \[t={{t}_{1}}-{{t}_{2}}\]
• B.               \[t=\frac{{{t}_{1}}+{{t}_{2}}}{2}\]
• C.             \[t=\sqrt{{{t}_{1}}{{t}_{2}}}\]
• D.               \[t=t_{1}^{2}t_{2}^{2}\]