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A particle is projected with speed u at ...

A particle is projected with speed `u` at angle `theta` to the horizontal. Find the radius of curvature at highest point of its trajectory

A

is not minimum at highest point

B

is minimum at the point of projection

C

is sameat all points

D

varies from `(u^(2))/(gcostheta)` to `(u^(2)cos^(2)theta)/(g)`

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The correct Answer is:
D
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