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Questions  

A particle is projected with a velocity u making an angle θ with the horizontal. At any instant, its velocity V is at right angles to its initial velocity u ; then V is

a
u cos θ
b
u tan θ
c
u cot θ
d
u sec θ

detailed solution

Correct option is C

Because horizontal component of velocity remains constant in projectile motion, henceucos⁡θ=Vcos⁡90∘−θucos⁡θ=Vsin⁡θ or V=ucot⁡θ

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