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Question Number 67215 by Learner-123 last updated on 24/Aug/19

Commented by Learner-123 last updated on 24/Aug/19

$$helpmeinQ.74.$$

Answered by mr W last updated on 24/Aug/19

$$h=4m$$$$s_1=h+0.75h=1.75h$$$$s_2=0.75h+0.{75}^{2}h=0.75\times 1.75h$$$$....$$$$s=\underset{n=1}{\sum ^{\mathrm{\infty }}}{s}_n=\frac{1.75h}{1-0.75}=7h=7\times 4=28m$$$$$$$$t_1=\sqrt{\frac{h}{4.9}}+\sqrt{\frac{0.75h}{4.9}}=(1+\sqrt{0.75})\sqrt{\frac{h}{4.9}}$$$$t_2=\sqrt{\frac{0.75h}{4.9}}+\sqrt{\frac{0.{75}^{2}h}{4.9}}=\sqrt{0.75}(1+\sqrt{0.75})\sqrt{\frac{h}{4.9}}$$$$...$$$$t=\underset{n=1}{\sum ^{\mathrm{\infty }}}{t}_n=\frac{1+\sqrt{0.75}}{1-\sqrt{0.75}}\times \sqrt{\frac{h}{4.9}}=12.58sec$$

Commented by Learner-123 last updated on 24/Aug/19

$$thankssir.$$

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