# physics

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A fully loaded 737 aircraft takes off at 250km/h.If its acceleration is a steady 3.3 , how long a runway is required? How much time does it take the plane to reach takeoff?

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Can you clarify the units for the acceleration of 3.3?

Note: the acceleration of a 737 is in the range of 1.6-1.9 m/s².

• physics -

3.3m/s^2

• physics -

That is a little fast for a fully loaded 737, but I'm not buying one, so it doesn't matter!

Hint: convert all quantities to consistent units, in this case, in metres and seconds.
For example,
Final speed, v1
=250 km/hr = 250 *1000m / 3600 s

Acceleration, a
= 3.3 m/s²

Time required, t
= v1/a s

Length of runway required, S
= v1²/(2a)

• physics -

where do you get the equation v1²/(2a)

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11

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3333

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