69. a particle is projected with velocity 20m/s so that it just clear two walls of equal height 10m which are at a distance 20m from each other the time of passing between the walls is

69. a particle is projected with velocity 20m/s so that it just clear

1.	69. a particle is projected with velocity 20m/s so that it just clear two walls of equal height 10m which are at a distance 20m from each other the time of passing between the walls is
Answer» 69. a particle is projected with velocity 20m/s so that it just clear two walls of equal height 10m which are at a distance 20m from each other the time of passing between the walls is