If an object is dropped from the top of a building and it reaches the ground at t = 4 s, then the height of the building is (ignoring air resistance) (g = 9.8 m s-2).
A. 77.3 m
B. 78.4 m
C. 80.5 m
D. 79.2 m
Answer:B
If an object is dropped from the top of a building and it reaches the ground at t = 4 s, then the height of the building is (ignoring air resistance) (g = 9.8 m s-2).
A. 77.3 m B. 78.4 m C. 80.5 m D. 79.2 m