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A ball is projected upwards from the top...

A ball is projected upwards from the top of a tower with a velocity `50ms^-1` making an angle `30^@` with the horizontal. The height of tower is 70m. After how many seconds from the instant of throwing, will the ball reach the ground. `(g=10 ms^-2)`

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A bullet is projected upwards from the top of a tower of height 90 m with the velocity 30 ms^(-1) making an angle 30^(@) with the horizontal. Find the time taken by it to reach the ground is (g=10 ms^(-2))

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