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[" 1.A ball is projected upwards from th...

[" 1.A ball is projected upwards from the top of a tower "],[" with velocity "25ms^(-1)" making an angle of "30^(@)" with the "],[" horizontal.If the height of the tower is "70m" ,after iv hat "],[" time from the instant of throwing,will the ball reach "],[" the ground? (Take "g=10ms^(-2)" ) "],[[" (a) "2s," (b) "5s," (c) "7s," (d) "9s]]

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