The next two questions are worth 20 points in total. For both questions, consider the following: A 5 kg and 8 kg block are on a horizontal table. The 5 kg block is initially at rest and the 8 kg block is initially moving directly toward the 5 kg block with m velocity 4 m/s. The two blocks stick together and slide off the table. You want to determine the speed of the blocks immediately before they hit the ground. You may assume that the blocks lose no energy due to friction with the table or by air resistance.
1. What is the speed of the blocks immediately after they collide?
A. 2.46 m/s
B. 6.40 m/s
C. 10.7 M/s
D. 3.14 m/s
E. 4.48 m/s
2. What is the speed of the blocks immediately before they hit the ground?
A. 3.43 m/s
B. 4.22 m/s
C. 4.65 m/s
D. 7.26 m/s
E. 2.39 m/s