A particle is projected upwards with a velocity of `100 m//sec` at an angle of `60^(@)` with the vertical. Find the time when the particle will move perpendicular to its initial direction, taking `g = 10m//sec^(2)`.

A particle is projected upwards with a velocity of 100 m//s at an angle of 60^(@) with the vertical. Find the time when the particle will move perpendicular to its initial direction, taking g = 10 m//s^(2) .

A particle is projected upwards with a velocity of 100 m//s at an angle of 60^(@) with the vertical. Find the time when the particle will move perpendicular to its initial direction, taking g = 10 m//s^(2) .

A particle is projected upwards with a velocity of 110m/sec at an angle of 60^(@) with the vertical. Find the time when the particle will move perpendicular to its initial direction, taking g =10m//sec^(2)

A particle is projected with a velocity of 39.2m/sec at an elevation of 30. Find (i) the time of flight.(ii) the greatest height.

A particle is projected with a velocity of 20sqrt(3) m s^(-1) at an angle of 60^(@) to the horizontal.At the moment,the direction of motion of the projectile is perpendicular to the direction of initial velocity of projection, its velocity is?