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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A particle is projected from the ground at an angle 30 with the horizontal with an initial speed 20 m/s. After how much time will the velocity vector of projectile be perpendicular to the intial velocity?

A particle is projected from the ground at an angle 30 with the horizontal with an initial speed 20 m/s. After how much time will the velocity vector of projectile be perpendicular to the intial velocity?

All the particles thrown with same initial velocity would strike the ground. a. with same speed b. simultaneously c. time would be least for the particle thrown with velocity v downward i.e. particle 1