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A common demonstration, illustrated below, consists of a ball resting at one end of a board of length and elevated at an angle è. A light cup is attached to the board at r so that it will catch the ball when the support stick is suddenly removed.

(a) Show that the ball will lag behind the falling board when è < 35.3°

(b) If the board is 1.40 m long and is supported at angle è = 33.8°, how far from the moving end of the board should the cup be placed?
1 cm

1 answer

i would apply conservation of momentum
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