2.Motion in Straight Line
easy

A stone thrown upward with a speed $u$ from the top of a tower reaches the ground with a velocity $4 u$. The height of the tower is .........

A

$\frac{15 u^2}{2 g}$

B

$\frac{7 u^2}{2 g}$

C

$\frac{16 u^2}{g}$

D

Zero

Solution

(a)

$v=\sqrt{u^2+2 g h}$

$(4 u)^2=u^2+2 g h$

$\frac{16 u^2-u^2}{2 g}=h \Rightarrow h=\frac{15 u^2}{2 g}$

Standard 11
Physics

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