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[" 4.A body is projected downwards at an...

[" 4.A body is projected downwards at an angle of "],[30^(@)" to the horizontal with a velocity of "9.8m/s],[" from the top of a tower "29.4m" high.How long "],[" will it take before striking the ground? "],[qquad [" [Ans."2*0s]]]

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