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

Explanation:

Step1: Recall the acceleration formula

Acceleration \( a \) is given by the change in velocity over time, so \( a=\frac{v_f - v_i}{t} \), where \( v_f \) is final velocity, \( v_i \) is initial velocity, and \( t \) is time.

Step2: Identify values

Here, \( v_i = 245\space m/s \), \( v_f = 230\space m/s \), and \( t = 7\space s \).

Step3: Substitute into the formula

Substitute the values into the formula: \( a=\frac{230 - 245}{7}=\frac{- 15}{7}\approx - 2\space m/s^2 \) (rounded to the nearest integer).

Answer:

A. \(-2\space m/s^2\)