A particle is projected from the ground at an angle with the horizontal with an initial speed . At what time after which velocity vector of projectile is perpendicular to the initial velocity? [in second] |

A particle is projected from the ground at an angle with the horizontal with an initial speed . At what time after which velocity vector of projectile is perpendicular to the initial velocity? [in second] |

1 Answer

127 votes

**(4)**

Initial velocity

Velocity after time is

Since and are perpendicular to each other

127 votes

127