A 0.010-kg bullet is fired straight up at a falling wooden block that has a mass of 2.0 kg. The bullet has a speed of 750 m/s when is strikes the block. The block originally was dropped from rest from the top of a building and had been falling for time (t) when the collision with the bullet occurred. As a result of the collision, the block (with the bullet in it) reverses direction, rises, and comes to a momentary halts at the top of the building. Find time (t).