A block of mass m = 5.6 kg, moving on a frictionless surface with a velocity of vi=6.5m/s to the right, collides with a block of mass M at rest, as shown in the figure. After the collision, the 5.6-kg block recoils with a velocity of vf=0.70m/s to the left. If the blocks are in contact for 0.20 s, what is the magnitude of the average force on the 5.6-kg block, while the two blocks are in contact?

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