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87. A stick of length l and mass M lies on a frictionless horizontal surface on which it is free to move in any way. A ball of mass m moving with speed v collides elastically with the stick as shown in the figure. If after the collision ball comes to rest, then what should be the mass of the ball

(a) m=2M

(b) m=M

(c) m=M/2

(d) m=m/4

Ans. d

(13)

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