Pretest: Unit 3 Question 8 of 32
When you drop a penny off the roof of a building, it takes 16 seconds to reach
the ground. How high is the roof?
A. 980.9 m
B. 1254.4 m
C. 1073.0 m
D. 1580.6 m

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

answer: (431,2)

step-by-step explanation: