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[" 30) A tennis ball is dropped on the f...

[" 30) A tennis ball is dropped on the floor fromaheight of "],[20m" .It rebounds to a height of "5m" .The ball was in "],[" contact with the floor for "0.01" s.What was its average "],[" acceleration during the contact? "(g=10m/s^(2)" ) "],[[" (1) "3000m/s^(2)," (2) "2000m/s^(2)],[" (3) "1000m/s^(2)," (4) "500m/s^(2)]]

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