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Answer to Question #60130 in Mechanics | Relativity for ANANTH

Question #60130
A ball dropped from a certain height, falls in the influence of uniform gravity, strikes the ground and repeatedly rebounds elastically. During a time interval t = 8s from it was dropped, it covers a distance s = 20m. How many collisions n during this time did the ball made with the ground? Acceleration of free fall is g = 10 m/s2
ANSWER IS 8 COLLISIONS
CAN U PLEASE EXPLAIN IN DETAIL
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