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a ball is thrown out of a window(which is 7.5m above the ground) with a speed...

a ball is thrown out of a window(which is 7.5m above the ground) with a speed Vo at 45 angle. It lands 15m from the wall of the building. Find:

The initial velocity,Vo

The impact velocity of the ball

answer: 10 m/s , 7i -14j

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