Posted by **mark matat** on Monday, February 14, 2011 at 4:16pm.

Assume acceleration due to gravity=10 m/s. A ball is thrown vertically upward from top of a building with speed of 20 m/s. On the way back ball misses the building and lands on the ground. Total time the ball is in air is 6 seconds. Determine the height of the building with speed of 30 m/s.

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