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

Acceleration,
`a=-2.14\ m/s^2`

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=(v-u)/(t)`

`a=(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).