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Simple acceleration, force, and mass question

  1. Oct 1, 2013 #1
    1. The problem statement, all variables and given/known data

    A 30 tonne jumbo jet accelerates down the runway at 4 m/s².What must be the thrust on
    each of its four engines?

    2. Relevant equations

    Acceleration = force/mass

    the formula gives acceleration in m/s², provided that the force is in N and the mass is in kg

    3. The attempt at a solution

    This is what I attempted (Not sure if it's correct)

    Firstly, we need to convert the tonne into kg. Therefore, 30 tonne = 30000kg

    Step 1: Acceleration = force/mass
    Step 2 (embedding the digits): 4 = f/30000
    Step 3 (multiplying both sides by 30000) 4 x 30000 = f/30000 (30000)
    Step 4 (Simplifying) 120000 = F

    I found that my answer is 120000 Newtons (N) is the total thrust but because there is 4 engines, we must divide the force by 4, which will amount to 30000 newtons on each engine.

    ^that is my reasoning for this question which I suspect is probably flawed in one way or another for a couple of reasons. I'd like your help in knowing if I did something incorrect and if so, I'd like your help in correcting it.
  2. jcsd
  3. Oct 1, 2013 #2


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    Science Advisor
    Homework Helper

    I think it's perfectly correct.
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