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A stone is relased from top of a lower. It covers a distance of 80m in last 2 seconds of its motion. Then the height of the lower is : `(g = 10 m//s^(2))`A. `320m`B. `245m`C. `180m`D. `125m` |
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Answer» Correct Answer - D A stone is ………. `s_(n) - s_(n.2) = 80` `[0xxn+(1)/(2)xx10xxn^(2)] - [0xx(n-2)+ (1)/(2)xx10(n-2)^(2)] = 80` `n = 5` height of tower `= S_(5)` `= 0xx5+(1)/(2)xx10xx5^(2)=125` |
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