Answer:
The apple's velocity when it's thrown is 12.25 m/s
Explanation:
Vertical Launch Upwards
In a vertical launch upwards, an object is launched vertically up without taking into consideration any kind of friction with the air.
If vo is the initial speed and g is the acceleration of gravity, the time it needs to reach the maximum height is:
[tex]\displaystyle t=\frac{v_o}{g}[/tex]
Once it reaches the maximum height, the object takes the same time to go back to the launch point.
The apple thrown by Joe Average takes 2.5 s to complete the whole flight, thus the time it went up is t=2.5/2=1.25 seconds.
From the equation above, we solve for vo:
[tex]v_o=gt= 9.8*1.25[/tex]
[tex]v_o=12.25\ m/s[/tex]
The apple's velocity when it's thrown is 12.25 m/s
