A ball is thrown vertically downward with a velocity of 20 m/s from the top of a tower. It hits the ground after some time with a velocity of 80 m/s . The height of the tower is : (g = 10 m/s 2 )

1. A. 340 m
2. B. 320 m
3. C. 300 m
4. D. 360 m

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