A block of mass m = 3.5 kg, moving on a frictionless surface with a speed Vmo = 6.2 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 (VMo = 0). Just after the collision, the 3.5-kg block recoils (moves left) with a speed of Vm1 = 1.5 m/s and the unknown mass block moves right with a speed of VM1 = 2.1 m/s. What is the mass M of the second block? m M m M before after

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