** please round to 3 significant figures! 1. A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 93.5 kg. The mass of the rock is 0.260 kg. Initially the wagon is rolling forward at a speed of 0.460 m/s. Then the person throws the rock with a speed of 16.5 m/s. Both speeds are relative to the ground. Find the speed of the wagon after the rock is thrown directly forward. ________ m/s Find the speed of the wagon after the rock is thrown directly backward. ___________ m/s 2. A two-stage rocket moves in space at a constant velocity of 5000 m/s. The two stages are then separated by a small explosive charge placed between them. Immediately after the explosion the velocity of the 1180-kg upper stage is 5640 m/s in the same direction as before the explosion. What is the velocity (magnitude and direction) of the 2500-kg lower stage after the explosion? magnitude ___________ m/s direction?