Question 17 (1 point) A block of mass m = 3.9 kg, moving on frictionless surface with a speed v; = 11.0 m/s, makes a sudden perfectly elastic collision with a second block of mass M, as shown in the figure. The second block is originally at rest. Just after the collision, the 3.9-kg block recoils with a speed of vy = 3.8 m/s. What is the mass M of the second block? V M M before after Record your answer to two digits after the decimal point. No units Your Answer:Question 13 {1 point} An M=?4kg man is skating northward and happens to suddenly collide with a m= 30kg boy who is ice skating toward the east. Immediately.r after the collision, the man and boarr are seen to be moving together at 6.? mfs in a direction 51" north of east. How fast was the boy moving just before the collision? Record your answer to two digits after the decimal point. No units YourAnswer: :l Answer Question 19 {1 point} An 81kg man is skating northward and happens to suddenly collide with a 4Ukg boy who is ice skating toward the east. Immediatelyr after the collision. the man and boy are seen to be moving together at 4.2 mfs in a direction F5\" north of east. How fast was the boilr moving just before the collision? Record your answer to two digits after the decimal. no units Your Answer: :]