Kinematics Question 624

Question: If a particle is projected with speed u from ground at an angle with horizontal, then radius of curvature of a point where velocity vector is perpendicular to initial velocity vector is given by

Options:

A) u2cos2θg

B)u2cot2θgsinθ

C) u2g

D)u2tan2θgcosθ

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Answer:

Correct Answer: B

Solution:

[b] Horizontal components of velocity at O and P are equal. vcos(90θ)=ucosθ

or v sinθ=ucosθ

or v=ucosθ

At P, vT2R=ac ;

u2cot2θgsinθ=R



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