Question

An airplane traveling 245 m/s east experiences turbulence, so the pilot slows down to 230 m/s. It takes the pilot 7 seconds to slow down to this speed. What is the acceleration of the plane? Round your answer to the nearest hundredth.
2.14 m/s2
–2.14 m/s2
67.86 m/s2
–67.86 m/s2

Answer 1

I think the answer is B. -2.14 m/s2

Answer 2

Answer:

Acceleration, $a=-2.14\ m/s^2$    

Step-by-step explanation:

Initial speed of the airplane, u = 245 m/s

Final speed of the airplane, v = 230 m/s

The pilot takes 7 seconds to slow down to this speed. Let a is the acceleration of the plane. The change in velocity per unit time is called the acceleration of an object. It can be calculated as :

$a=\dfrac{v-u}{t}$

$a=\dfrac{230\ m/s-245\ m/s}{7\ s}$

$a=-2.14\ m/s^2$

So, the acceleration of the plane is $-2.14\ m/s^2$. Hence, the correct option is (b).