A riderless 10 kg sled is moving at a speed of 2 m/s. A 75 kg running at 3 m/s in the same direction jumps onto this sled. What will be the final velocity of the girl and the sled, assuming that the sled is on level snow and that there is negligible friction? * A 0.1 kg ball moving at a constant velocity of 2 m/s strikes a 0.4 kg ball that is at rest. After the collision, the first ball rebounds straight back at 1.2 m/s. Calculate the final velocity of the second ball A 25 kg object moving with a velocity of 3 m/s to the right collides with a 15 kg object moving to the left at 6 m/s. Find the velocity of the 25 kg object after the collision, if the 15 kg object continues to move to the left but at only 0.30 m/s A 1.5 kg wooden block remains stationary on a level surface of ice. What will be the final velocity of this wood block if a 0.002 kg (2 gram) bullet is fired into the block with a velocity of 300 m/s and becomes embedded into the wood block