Answer:
Height with sound ignored = Gravity x Time taken = 9.8 x 8.60 = 84.28 meters
Time taken by the sound = 84.28/330 = 0.255 seconds
Height with sound involved = (84.28 x 0.255) + 84.28 = 105.80 meters
a. Underestimated
 
        
             
        
        
        
The average speed is 615.7 mph (275.2 m/s)
Explanation:
The average speed of an object gives a measure of how fast an object is moving over a certain time interval. It is a scalar quantity, and it is calculated as follows

where
v is the average speed
d is the distance covered
t is the time interval
For the jet in this problem, we have:
d = 1293 mi is the distance covered
t = 2.1 h is the time interval
Therefore, the average  speed is:

We can also convert into SI units (m/s), keeping in mind that:

And so

Learn more about average speed:
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Answer:
His third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A.