A 3.0-kg block of wood rests on the muzzle opening of a vertically oriented rifle, the stock of the rifle being firmly planted on the ground. When the rifle is fired, an 8.0-g bullet (velocity 800 m/s upward) becomes completely embedded in the block. a. Find the velocity of the block/bullet system immediately after the collision. b. Ignoring air resistance, find how high the block/bullet system rises above the muzzle opening of the rifle.