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Q.

A stone dropped from the top of a tower travels 59 of the  height of tower during the last second of fall. Height of the tower is: (take g = 10 m/s2)

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a

52 m

b

36 m

c

45 m

d

78 m

answer is C.

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Detailed Solution

Let T =time of flight and H -height of tower, then H=12gT2 and H-59H=12gT-12⇒T=3sSo, height of the tower = 12(10)(3)2= 45m
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