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A ball is projected at an angle 45^(@) a...

A ball is projected at an angle `45^(@)` as shown with speed `20 sqrt2 m//s` at `t = 0`. At the same time wedge is made to move with velocity `40 m//s` in the direction shown, If the time at which the ball hits the wedge is `(sqrtx)/(cos 15^(@))` then value of x is

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