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A block of mass m=1.4 kg, moving on frictionless surface with a speed v1i=5.3 m/s, makes...

A block of mass m=1.4 kg, moving on frictionless surface with a speed v1i=5.3 m/s, makes a perfectly elastic collision with a block of mass M at rest, see the sketch. After the collision, the 1.4 kg block recoils with a speed of v1f=0.3 m/s. What is the speed of block M after the collision?

A.

v2f=4.8 m/s

B.

v2f=5.2 m/s

C.

v2f=3.4 m/s

D.

v2f=5.0 m/s

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