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CBSE Class 11-science Answered

Height of the tower?
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Asked by samratpaudel5 | 13 Aug, 2019, 07:29: PM
answered-by-expert Expert Answer
The formula to get answer :-  " v2 = u2 - 2gh " , where v is final speed, u is initial speed,
g is acceleration due to gravity and h is distance travelled.
 
If initial velocity is u and final velocity is 3u,   then we have   (3u)2 = u2 - 2gh  or  h = -4u2/g 
 
negative sign shows the net distance travelled is below the point where stone is thrown up.
This distance travelled is the height of the tower.
 
Hence height of the tower = 4u2/g
 
Answered by Thiyagarajan K | 13 Aug, 2019, 07:43: PM
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