A ball is thrown vertically  upward fro the top of a building with an initial velocity of 20 m/s at an initial height of 50 m  above the ground.The ball just misses the roof on its way down. a) Determine the time needed for the ball to reach maximum height b) the maximum height c) the time needed for the ball to return  to the height  from which it was thrown and its velocity at that instant

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Projectile Motion