Question

An airplane can reach a takeoff speed of 45 m/s (from rest) in 7.0 seconds. What is the minimum runway length required for a safe takeoff?

Answer 1

Find acceleration:
acceleration= (final velocity-initial velocity)/time

Then plug into the distance formula:
The distance = (1/2)*(acceleration)*(time)^2 + (initial velocity)*(time)

Answer 2

Is the initial velocity 0?

Answer 3

yes, the key word from the problem: "from rest"

Answer 4

and is the final velocity 45/7?

Answer 5

no, it is the takeoff speed of 45 m/s