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A boy stand l=4m away from a vertical wa...

A boy stand l=4m away from a vertical wall and throws a ball. The ball leaves the boy's hand at h=2m above the ground with initial velocity v 0 = 10 √ 2 m s at an angle `45^ ∘` from the horizontal. After striking the wall elastically the ball rebounds and hit the ground at 4K (in m).Find K (take `g=9.8m/s^(2)`)

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