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A particle is projeted with a velocity 'u' at an angle [tex]\theta[/tex] with the horizontal. Find the radius of curvature of the parabola traced out by the particle at the point where the velocity makes an angle [tex]\theta/2[/tex] with the horizontal.

I got [tex]u^2[/tex]/gcos[tex]\theta/2[/tex] but my book gives a different answer.

Can someone please help me?

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# Radius of curvature of a Projectile

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