A body is projected horizontally from a height of `20 m`. It reaches the ground at a horizontally distance of `40 m`. The speed of practicle when it hits the ground is

A body, rpojected horizontally with a speed u from the top of a tower of height h , reaches the ground at a horizontally distance R from the tower. Another body, projected horizontally from the top of a tower of height 4h , reaches the ground at horizontal distance 2R from the tower. The initial speed of the second body is

A body is thrown horizontally from the top of a tower. It reaches the ground after 4s at an angle 45° to the ground. The velocity of projection is

A body is thrown horizontally from the top of a tower. It reaches the ground after 4s at an angle 45° to the ground. The velocity of projection is

A body is thrown horizontally from the top of a tower. It reaches the ground after 4s at an angle 45^(@) to the ground. The velocity of projection is