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170 Elastic collisions The students from the previous page decided to investigate collisions in which the objects rebound. They reversed the orientation of one set of magnets so ih carts would then 'rebound" areso that the magnets would repel each other as the carts came together, The "after the collision, In the first two trials cart 2 was stationary, In trials 3-5, cart 2 was moving. The results of the five trials that they carried out are shown in Table 3 Velocity cart 2 after Trial Velocity cart 1 Velocity cart 2 | Velocity cart 1 atter (m/s) (m/s) collision (m/s) collision (m/s) 0.49 0.00 0.01 0.50 0.01 0.56 2 0.55 0.DO 3 0.21 -0.56 -0.56 0.22 3.45 -0.43 -0.42 0.46 0.40 0.10 0.10 0.40 2. Complete Table 4 (below) using the results in Table 3. Recall that mass of cart 1 = 0.75 kg and mass of cart 2 = 0,73 kg. Table 4. Momentum from Table 3 results Momentum cart 1 Momentum cart 2 Momentum cart 1 after Momentum cart 2 after (kg m/s) (kg m/s) collision (kg m/s) collision (kg m/s) 3. Explain the students' results from Tables 3 and 4: 4. Looking at the results from Tables 1 and 2 from the previous page and tables 3 and 4 above, write a mathematical expression to model the results. 5. A car with a mass of 1000 kg is traveling east with a speed of 20 m/s. A 2000 kg pickup truck traveling west at 15 m/s crosses the median and the two vehicles collide. (a) If the two vehicles stuck together upon impact like the carts in the students' investigation on the previous page, what would the resulting velocity of the vehicles be immediately after impact? (b) Perfectly elastic collisions (like the carts in the students' investigation above), don't usually happen in car crashes because energy is lost as heat and sound, and in the deformation of the vehicles. These means they rebound more slowly than might be expected. What would the resulting velocity of the car be if the velocity of the truck after the impact was 3.5 m/s to the east? 07020 BIOZONE Internation