Problem

Problem

A particle is projected from a point PP with a velocity vv at an angle θ\theta with horizontal. At a certain point QQ it moves at right angles to its initial direction. Then a. velocity of particle at QQ is vsin⁡θv \sin \theta b. velocity of particle at QQ is vcot⁡θv \cot \theta c. time of flight from PP to QQ is (v/g)csc⁡θ(v/g) \csc \theta d. time of flight from PP to QQ is (v/g)sec⁡θ(v/g) \sec \theta

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