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Q.
A stone is shot straight upward with a speed of $20\, m/s$ from a tower $200\, m$ high. The speed with which it strikes the ground is approximately
Rajasthan PETRajasthan PET 2003
Solution:
Speed of stone in a vertically upward direction is $20 m / s$.
So for vertical downward motion we will consider $u =-20 m / s$
$
\begin{array}{l}
v^{2}=u^{2}+2 gh =(-20)^{2}+2 \times 9.8 \times 200=4320 m / s \\
\therefore v \simeq 65 m / s
\end{array}
$