Question 20 (1 point) A block of mass m = 5.3 kg, moving on frictionless surface with a speed v; = 11.8 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 m=5.3-kg block recoils with a speed of v = 2.6 m/s. What is the magnitude of the velocity of the object with mass M of the second block? M M before after Record your answer to two digits after the decimal. no units Your