Calculating the launch angle of a horizontal launch (mechanics) [closed]

I need some help with the following question:

A smooth spherical object (the first object) is projected horizontally from a point of vertical height H = 26.38 metres above horizontal ground with a launch speed (initial velocity) of u = 21.05m/s

A second identical object is projected from ground level with launch speed (initial velocity) v and at an angle A above the horizontal.

Calculate the value of this launch angle A in radians, if the second object is to have the same horizontal range and the same time of flight as the first object. Take acceleration at gravity to be $g = 9.81m/s^2$.

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migrated from math.stackexchange.comMar 22 '12 at 15:23

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closed as too localized by John Rennie, David Z♦Mar 22 '12 at 23:31

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What @Raskolnikov said. Try this forum instead. – 0sh Mar 22 '12 at 10:19
@Raskolnikov: Thanks for the input – Xavier Mar 22 '12 at 14:33
Yeah, Physics Forums is a better place for asking for help on a specific homework problem (though they also expect you to show work there). – David Z Mar 22 '12 at 23:32