#78
Airplane start with initial speed

now the takeoff velocity is given as


acceelration is given as

now we have

from above equation we have


#79
Airplane start with initial speed

now the takeoff velocity is given as


acceelration is given as

now we have

from above equation we have


Answer:
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Explanation:
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Answer:
displacement at 45 s = 30
65 s = 50
So the average speed over the interval from 45 s to 65 s is
(50 - 30) cm / 20 s = 1 cm / sec
As a check an average speed of 1 cm / sec for 20 sec will produce a
displacement of 1 cm / sec * 20 sec = 20 cm or from 30 to 50 cm