Question 7 (4 points) A 47 kg skateboarder running at 4.7 m/s [N] jumps onto a 3.8 kg skateboard moving at 3.1 m/s [N]. How fast will the skateboarder and board be travelling once she jumps on the board? Your Answer: Answer units Add attachments to support your work Question 8 (5 points) During a trick shot demonstration, a pool player shoots a 170 g cue ball directly at a 150 g billiard ball that is moving towards the cue ball with a velocity of 3.7 m/s. The perfectly elastic collision between the billiard ball and the cue ball occurs when the cue ball is moving at a velocity of 5.7 m/s. Determine the velocity of the billiard ball and the cue ball directly after the collision. Note: For this question, please include all of your work on your written solution. Include the velocity for both the cue ball and the billiard ball. There is no need to place your answer in the answer box for this problem (it only checks the velocity of the cue ball). Your Answer: Answer units Add attachments to support your work Question 9 (6 points) Two gliders move frictionlessly towards each other. Glider A has a mass of 1.7 kg and is moving right at a speed of 1.8 m/s. Glider B has a mass of 2.0 kg and is moving left at a speed of 2.2 m/s. Glider B is cushioned by a spring with a spring constant of 1.5 x 10# N/m. Determine the maximum compression of the spring during the collision. Your Answer: Answer units