A particle is projected with a speed u at angle 
with the horizontal. Consider a small part near the highest position and take it approximately to be a circular arc. What is the radius of this circle? This radius is called the radius of curvature of the curve at the point.
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Particle is projected with speed 'u' at an angle 
. At the highest pt. the vertical component of velocity is ' 0 '
So, at that point, velocity 
centripetal force 
At highest pt.
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