1.

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`

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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