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Q.

If a particle is projected with speed u from the ground at an angle θ with horizontal. Radius of curvature of a point where velocity vector is perpendicular to initial velocity vector is given by

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a

u2cot2θgsinθ

b

u2tan2θgcosθ

c

u2g

d

u2cos2θg

answer is B.

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Detailed Solution

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vcos(900θ)=ucosθ  orvsinθ=ucosθ;  v=ucotθ

vT2R=ac;u2cot2θgsinθ=R

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If a particle is projected with speed u from the ground at an angle θ with horizontal. Radius of curvature of a point where velocity vector is perpendicular to initial velocity vector is given by