Answer:
In his speech, Roosevelt's main purpose was to boost morale after the Pearl Harbor attack. After this event, the American public was worried about the future, and nervous about the possibility of further attacks. Therefore, Roosevelt wanted to reassure Americans that their safety was the military's main concern. He also addresses them in order to explain his reasons for going to war against Japan.
Explanation:
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If the jet plane is taking off, we know that initially the plane isn't moving (initial speed is zero, Vo=0m/s), the final speed (the one the plane needs to takeoff is 75m/s (Vf=75m/s), we need to verify if accelerating at a rate of 1.3m/s^2, the plane can reach the takeoff speed in a distance of 2.5km (the length of the runway). To do that we calculate the distance that will take to reach that speed, like the following:
this is the formula we are using, where "a" is the acceleration and "d" is the distance we are going to calculate.
d=2146.63m=2.146km.
The plane needs 2.146km to reach the takeoff speed, and the runway has 2.5km, so the plane will be able to use the runway safety.
c. he arrived at every basketball practice on time.