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.)

Answer 1

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➤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

$-2 m/s² [E].$

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Answer 2

►Use the formula for acceleration:

α= Δυ: Δt

This is the same as:

a = (v₂ − v₁) ÷ At

Substitute values into equation and solve.

a = (230m/s [E] - 245m/s[E])÷7sa

-15m/s[E]÷7sa

= -2.1428m/s²[E]

Therefore the acceleration of the plane is

-2m/s²[E].