Which one of the following statements is correct for an object in free fall released from rest?
A)The average velocity during the first second of time is 4.9 m/s
B)During each second the object falls 9.8 m
C)The acceleration changes by 9.8 m/s every second
D)The object falls 9.8 m during the first second of time
E)The acceleration of the object is proportional to its weight

Question

Quizplus · Accepted Answer

The average velocity for an object in free fall, released from rest, is calculated using the formula $v_{avg} = \frac{v_i + v_f}{2}$, where $v_i$ is the initial velocity (0 m/s for an object released from rest) and $v_f$ is the final velocity at the end of the first second. Since the acceleration due to gravity ($g$) is $9.8 m/s^2$, the final velocity after one second is $9.8 m/s$. Thus, the average velocity is $\frac{0 + 9.8}{2} = 4.9 m/s$.

Which One of the Following Statements Is Correct for an Object