Calculate the acceleration of an airplane that starts at rest and reaches a speed 45m/s in 9 seconds

Here's the explanation of HOW to find the answer. That's much more important than the answer.

The two BOLD lines are the parts you need to remember. They're the things you LEARN when you STUDY. If you remember them, then you can solve almost ANY acceleration problem.

Acceleration = (change in speed) / (time for the change)

Change in speed = (speed at the end) minus (speed at the beginning)

Change in speed = (45 m/s) minus (zero)

Change in speed = 45 m/s .

Acceleration = (45 m/s) / (9 sec)

Acceleration = 5 m/s²

d.7.5cm is your answer

the answer is a)

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