A shell is fired from a point O at an angle of 60º with a speed of 40 m/s & it strikes a horizontal plane through O, at a point A. The gun is fired a second time with the same angle of elevation but a different speed v. If it hits the target which starts to rise vertically from A with a constant speed 
m/s at the same instant as the shell is fired, find v. (Take g = 10 m/s2)
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