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.)
A.–2 m/s2
B. 2 m/s2
C. 67 m/s2
D.–67 m/s2

Answer 1

Use the formula for acceleration:

a = Δv ÷ Δt

This is the same as:

a = ( v₂-v₁ ) ÷ Δt

Substitute values into equation and solve.

a = (230 m/s [E] - 245 m/s [E] ) ÷ 7 s

a = -15 m/s [E] ÷ 7 s

a = -2.1428 m/s² [E]

Therefore the acceleration of the plane is -2 m/s² [E].

Answer 2

Answer:

A.–2 m/s2

Explanation: