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There is a long smooth slope and we release balls from the top of it every 1.5 s. Suppose the acceleration of the ball is 4.8 m/s2 and every ball is numbered in the releasing order. (a) 9.9 s after the first ball is release, what is the distance between ball No. 1 and ball No. 6? What is the distance between ball No. 2 and ball No. 7? (b) When ball No. 5 reached the speed of 15.0 m/s, what is the distance between ball No. 1 and ball No. 5? What is the distance between ball No. 2 and ball No. 5?

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