The number of frames between 140 and 243 is 103. Since each frame is equivalent to 24 seconds, multiply 103 by 24s to find the time elapsed:
[tex]t=103\times24s=2472s[/tex]Assuming constant acceleration, a the distance d traveled by an object starting at rest during a time t is:
[tex]d=\frac{1}{2}at^2[/tex]Isolate a from the equation and replace d=56m and t=2472s to find the acceleration the shuttle:
[tex][/tex]