Question

an airplane traveling 245 m/s east experienced turbulence, so the pilot decided to slow down to 230 m/s. it took the pilot 7 seconds to get down to this speed. what is the acceleration of the plane? (round your answer to the nearest whole number.)

Answer 1

I think is my answer is  –2 m/s2

Answer 2

By definition, we have to:

$vf = a * t + vo$

Where,

vf: final speed

a: acceleration

t: time

vo: initial speed

Clearing the acceleration we have:

$a = \frac{vf-vo}{t}$

From here, we substitute values.

We have then:

$a = \frac{230-245}{7}$

$a = -2.14 \frac{m}{s^2}$

Rounding to the nearest whole number:

$a = -2 \frac{m}{s^2}$

Answer:

the acceleration of the plane is:

$a = -2 \frac{m}{s^2}$

Note: the negative sign indicates that the plane is slowing down.