physics

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A woman throws a ball at a vertical wall 40m away the ball is 20m above the ground when it leaves woman's hand with an initial velocity of 14m/s at 45degrees.when the ball hits the wall the horizontal component of its velocity remain unchanged.(a)where does the ball hit the ground?(b)how long was the ball in the air before it hit a wall?(c)where did the ball hit the the wall?(d)How long was the the ball in the air after it left the wall?(Ignore any effects due to air resistance)

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    I don't understand the picture. How can the ball hit the ground and hit the wall?

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