A brick is thrown and released vertically upward with an initial speed of 2.00 m/s from the top ledge of a building, 12.0 m above ground level. The brick reaches its highest height, then moves downwards to strike the ground. Take upwards to be the positive vertical direction. With what speed does the brick strike the ground?
A. 10.8 m/s.
B. 11.0 m/s.
C. 15.3 m/s.
D. 15.5 m/s.
Answer:D
A brick is thrown and released vertically upward with an initial speed of 2.00 m/s from the top ledge of a building, 12.0 m above ground level. The brick reaches its highest height, then moves downwards to strike the ground. Take upwards to be the positive vertical direction. With what speed does the brick strike the ground?
A. 10.8 m/s. B. 11.0 m/s. C. 15.3 m/s. D. 15.5 m/s.