FIGURE CP12.89 shows a cube of mass m sliding without friction at speed v₀. It undergoes a perfectly elastic collision with the bottom tip of a rod of length d and mass M = 2m. The rod is pivoted about a frictionless axle through its center, and initially it hangs straight down and is at rest. What is the cube??s velocity?? both speed and direction??after the collision?

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M d m FIGURE CP12.89