Please carefully take your time to do these "Linear momentum and collisions" in PCS211! For questions 7a and 7b, the direction options are "right," "left," "up," and "down." For question 15a, the direction options are "right," and "left."

7. [-/4 Points] DETAILS SERPSE10 9.3.OP.007. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A ball falls from height of 18.5 m, hits the floor, and rebounds vertically upward to height of 15.5 m. Assume that mball = 0.200 kg. (a) What is the impulse (in kg . m/s) delivered to the ball by the floor? magnitude kg . m/s direction ---Select--- v (b) If the ball is in contact with the floor for 0.0400 seconds, what is the average force (in N) the floor exerts on the ball? magnitude N direction -Select--- v Need Help? Read It15. [-/4 Points] DETAILS SERPSE10 9.4.P.018. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Three carts of masses m, = 4.50 kg, m, = 8.00 kg, and m; = 3.00 kg move on a frictionless, horizontal track with speeds of v, = 4.50 m/s to the right, v2 = 3.00 m/s to the right, and v3 = 4.50 m/s to the left, as shown below. Velcro couplers make the carts stick together after colliding. Ug mg mg (a) Find the final velocity of the train of three carts. magnitude m/s direction ---Select--- v (b) Does your answer require that all the carts collide and stick together at the same moment? Yes O No What if they collide in a different order? This answer has not been graded yet