A plane, diving with constant speed at an angle of 52.0 degree with the vertical, releases a projectile at an altitude of 790 meter. The projectile hits the ground 4.00 second after release. (Suppose a coordinate system in which the airplane is moving in the positive horizontal direction, and in the negative vertical direction. Ignore air resistance.)
(a) Compute how far did the projectile travel horizontally during its flight?
(b) Find what were the horizontal and vertical components of its velocity just before striking the ground?