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In a sports competition, a javelin in thrown at an angle $45^{\circ}$, which recorded a range of $90 \mathrm{~m}$. The maximum height reached by the javelin is
(Neglect air resistance and acceleration due to gravity $=10 \mathrm{~ms}^{-2}$ )
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(Neglect air resistance and acceleration due to gravity $=10 \mathrm{~ms}^{-2}$ )
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Verified Answer
The correct answer is:
$22.5 \mathrm{~m}$
$\mathrm{R}=\frac{\mathrm{H}}{4} \tan \theta=\frac{90}{4} \tan 45^{\circ}=22.5 \mathrm{~m}$
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