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