A projectile is launched from ground level at with a initial speed of 400 m/s. making an angle of 60" with the horizontal. When the projectile reaches the highest point in its trajectory, it explodes into two equal fragments. One of these fragments stops momentarily and then falls vertically down, hitting ground exactly below the point where the projectile exploded. How far from the launching points does the other fragment hit the ground? Assume that the ground is perfectly horizontal and that air drag is negligible. O 17.1 km O 21.2 km O 14.1 km O 10.6 km O 28.2 km