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[" A ball is thrown vertically upward at...

[" A ball is thrown vertically upward attains a maximum height of "45m" .The time after which velowy,"],[" become equal to half the velocity of projection? (use "g=10m/s^(2)" ) "],[[" (1) "2s," (2) "1.5s],[" (3) "1s," (4) "0.5s]]

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