A body is projected horizontally from the top of a tower with initi...

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A body is projected horizontally from the top of a tower with initial velocity \( 18 \mathrm{~ms}^{-1} \). It hits the ground
\( \mathrm{P} \)
at angle \( 45^{\circ} \). What is the vertical component of
W
velocity when it strikes the ground?
(1) \( 18 \sqrt{ } 2 \mathrm{~ms}^{-1} \)
(2) \( 18 \mathrm{~ms}^{-1} \)
(3) \( 9 \sqrt{ } 2 \mathrm{~ms}^{-1} \)
(4) \( 9 \mathrm{~ms}^{-1} \)
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