A plank of length 2l and mass m lies on a frictionless plane. A ball also of mass m strikes the end of the plank with speed vo as shown. After the collision, the ball continues along the original line of motion with decreased speed. Mechanical energy is conserved in the collision. a) Find the final velocity of the ball, vf. [Ans: 3vo/5] b) The experiment is repeated, but this time the plank is pivoted (pegged to the ground) at its lower end. Find vf. [Ans: vo/2]
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