Question

A body falling from a high Minaret travels $40m$ in the last $2$ seconds of its fall to ground. Height of Minaret in metres is
(take $g=10m/s^2$)

• A. $60$
• B. $45$
• C. $80$
• D. $50$

Answer 1

The correct option is B $45$

Taking the height of minaret is $H$ and time taken by body to fall from top to bottom be $T$.

$\therefore H=\left(1/2\right)g{T}^2$.....(1)

In last two second body travels a distance of 40m, henc ein $(T-2)sec$ body will travel $(H-40)m$.

$(H-40)=\left(1/2\right)g(T-2{)}^2$.......(2)

$\therefore$ solving (1) and (2),

$T=3sec,H=45m$

Hence option $B$ is correct.