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[" 20.A ball is dropped from a bridge "1...

[" 20.A ball is dropped from a bridge "122.5" metres above a river in the ball has been falling for "2" seconds,a "],[" second ball is thrown straight down after it what must be its intial velocity so that both hit the water at the "],[" same time? "(g-9.8m/s^(2))" ."],[[" (1) "49m/s," (2) "55.5m/s],[" (3) "26lm/s," (4) "9.8m/s]]

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