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.

Use acceleration = (final velocity − initial velocity) ÷ time. The plane’s velocity changes from 245 m/s east to 230 m/s east in 7 seconds, so its acceleration is (230 − 245) ÷ 7 = −15 ÷ 7 ≈ −2.14 m/s². The negative sign means the acceleration is opposite the eastward direction of travel. The correct choice is −2.14 m/s².

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