A stone is shot straight upward with a speed of 20, m/sec from a tower 200, m high. speed with which

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2.Motion in Straight Line

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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

$60 $

B

$65$

C

$70$

D

$75$

Solution

(b) Speed of stone in a vertically upward direction is $20\;m/s$. So for vertical downward motion we will consider $u = – 20\;m/s$

${v^2} = {u^2} + 2gh = {( – 20)^2} + 2 \times 9.8 \times 200 = 4320\;m/s$

$v\simeq 65\,m/s$.

Standard 11

Physics

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