A stone is shot straight upward with a speed of $20\, m/sec$ from a tower $200\, m$ high. The speed with which it strikes the ground is approximately........$m/sec$
A stone is shot straight upward with a speed of $20\, m/sec$ from a tower $200\, m$ high. The speed with which it strikes the ground is approximately........$m/sec$
$60 $
$65$
$70$
$75$
A stone is shot straight upward with a speed of $20\, m/sec$ from a tower $200\, m$ high. The speed with which it strikes the ground is approximately........$m/sec$
Speed of stone in a vertically upward direction is $20\;m/s$. So for vertical downward motion we will consider $u = - 20\;m/s$
${v^2} = {u^2} + 2gh = {( - 20)^2} + 2 \times 9.8 \times 200 = 4320\;m/s$
$v\simeq 65\,m/s$.
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