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19 May, 15:52

A jet plane is cruising at 300 m/s when suddenly the pilot turns the engines up to full throttle. After traveling 4.0 km, the jet is moving with a speed of 400 m/s.

What is the jet's acceleration, assuming it to be a constant acceleration?

I got:

a =

8.8

m/s2

Is your answer reasonable? Explain.

+3
Answers (1)
  1. 19 May, 19:20
    0
    The answer got is reasonable.

    Explanation:

    We have equation of motion v² = u² + 2as

    Initial velocity, u = 300 m/s

    Acceleration, a = ?

    Final velocity, v = 400 m/s

    Displacement, s = 4 km = 4000 m

    Substituting

    v² = u² + 2as

    400² = 300² + 2 x a x 4000

    a = 8.75 m/s² = 8.8 m/s²

    The acceleration is 8.8 m/s²

    The answer got is reasonable.
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