Answer:
B. 1254.4 m
Explanation:
From the question,
Using,
S = ut+ 1/2gt²...................... Equation 1
Where S = height of the roof, u = initial velocity of the roof, t = time, g = acceleration due to gravity.
Given: u = 0 m/s (dropped from an height), t = 16 seconds
Constant: g = 9.8 m/s²
Substitute these values into equation 1
S = 0(16)+1/2(9.8)(16²)
S = 2508.8/2
S = 1254.4 m
Hence the height of the roof is 1254.4 m
