Kinematics Question 192
Question: A stone thrown upward with a speed $ u $ from the top of the tower reaches the ground with a velocity $ 3u $ . The height of the tower it’s [EAMCET 1983; RPET 2003]
Options:
A) $ 3u^{2}/g $
B) $ 4u^{2}/g $
C) $ 6u^{2}/g $
D) $ 9u^{2}/g $
Show Answer
Answer:
Correct Answer: B
Solution:
$ v^{2}=u^{2}+2gh $
$ \Rightarrow {{(3u)}^{2}}={{(-u)}^{2}}+2gh\Rightarrow h=\frac{4u^{2}}{g} $
