A crane is pulling a concrete slab with a velocity of 2.5 m/s with an upward acceleration of 0.4 m/s2. At this moment, a stone was dropped at a point 40 meters above the concrete slab. Solve for: the time at which the stone and concrete slab will pass each other, the distance traveled by the concrete slab at the time these particles pass each other, and the velocity of the stone at the time they pass each other