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 integer.)

–2 m/s2
2 m/s2
67 m/s2
–67 m/s2

Answer 1

-2m/s²

Step-by-step explanation:

Edge 2020

Answer 2

The acceleration of the plane : -2 m/s²(negative=deceleration)

Further explanation

Given

vo=245 m/s

vt=230 m/s

t = 7 s

Required

The acceleration

Solution

Motion with constant acceleration

`\tt v_t=v_o+at`

Input the value

`\tt 230=245+a.7\\\\-15=7a\Rightarrow a=-2.14\approx rounded~-2~m/s^2`